The Brahman effulgence is impersonal, but the cause of that energy is the Supreme Personality of Godhead. From Him, in His abode, the Vaikuṇṭhas, this brahma-jyotir emanates. He is never impersonal. Since impersonalists cannot understand the source of the Brahman energy, they mistakenly choose to think this impersonal Brahman the ultimate or absolute goal. But as stated in the Upaniṣads, one has to penetrate the impersonal effulgence to see the face of the Supreme Lord. If one desires to reach the source of the sunshine, he has to travel through the sunshine to reach the sun and then meet the predominating deity there. The Absolute Truth is the Supreme Person, Bhagavān, as Śrīmad-Bhāgavatam explains.
(Sri Caitanya Caritamrta------1:1:53------purport).

"O Supreme Lord, You are the Supreme Maheśvara, the worshipable Deity of all the demigods and the Supreme Lord of all lords. You are the controller of all controllers, the Personality of Godhead, the Lord of everything worshipable."
mahān prabhur vai puruṣaḥ
sattvasyaiṣa pravartakaḥ
su-nirmalām imāṁ prāptim
īśāno jyotir avyayaḥ
"The Supreme Personality of Godhead is Mahāprabhu, who disseminates transcendental enlightenment. Just to be in touch with Him is to be in contact with the indestructible brahmajyoti."
(Sri Caitanya Caritamrta------1:2:22------purport).

The all-pervading Brahman, composed of the impersonal glowing rays of Śrī Kṛṣṇa, exists in the spiritual world with the Vaikuṇṭha planets. We can get some idea of that spiritual sky by a comparison to the material sky, for the rays of the sun in the material sky can be compared to the brahmajyoti, the glowing rays of the Personality of Godhead. In thebrahmajyoti there are unlimited Vaikuṇṭha planets, which are spiritual and therefore self-luminous, with a glow many times greater than that of the sun. The Personality of Godhead Śrī Kṛṣṇa, His innumerable plenary portions and the portions of His plenary portions dominate each Vaikuṇṭha planet. In the highest region of the spiritual sky is the planet called Kṛṣṇaloka, which has three divisions, namely Dvārakā, Mathurā and Goloka, or Gokula.
(Sri Caitanya Caritamrta------1:5:14------purport).

There are two kinds of liberated souls—those who are liberated by the favor of the Lord and those who are liberated by their own effort. One who gets liberation by his own effort is called an impersonalist, and he merges into the glaring effulgence of the Lord, the brahmajyoti. But devotees of the Lord who qualify themselves for liberation by devotional service are offered four kinds of liberation, namely sālokya (status equal to that of the Lord), sāmīpya (constant association with the Lord), sārṣṭi (opulence equal to that of the Lord) and sārūpya (features like those of the Lord).
(Sri Caitanya Caritamrta------1:5:30------purport).

Outside of Vaikuṇṭha, the abode of Kṛṣṇa, which is called paravyoma, is the glaring effulgence of Kṛṣṇa's bodily rays. This is called the brahmajyoti. The transcendental region of that effulgence is called Siddhaloka or Brahmaloka. When impersonalists achieve liberation, they merge into that Brahmaloka effulgence. This transcendental region is undoubtedly spiritual, but it contains no manifestations of spiritual activities or variegatedness. It is compared to the glow of the sun. Within the sun's glow is the sphere of the sun, where one can experience all sorts of varieties.
(Sri Caitanya Caritamrta------1:5:34------purport).

Since the entire Vedic literature deals with the subject of Brahman, Kṛṣṇa is therefore the ultimate goal of Vedic understanding. The impersonal brahmajyoti rests on the personal form of the Lord. Therefore although the impersonal effulgence, the brahmajyoti, is the first realization, one must enter into it, as mentioned in the Īśopaniṣad, to find the Supreme Person, and then one's knowledge is perfect. The Bhagavad-gītā (7.19) also confirms this: bahūnāṁ janmanām ante jñānavān māṁ prapadyate. One's search for the Absolute Truth by dint of speculative knowledge is complete when one comes to the point of understanding Kṛṣṇa and surrenders unto Him. That is the real point of perfectional knowledge.
(Sri Caitanya Caritamrta------1:7:140------purport).

The goal of human perfection is stated here in brief. One has to surpass all the planetary systems of the material universe, pierce through the covering of the universe and reach the spiritual world, known as Vaikuṇṭhaloka. The Vaikuṇṭhalokas are variegated spiritual planets situated in the Lord's impersonal bodily effulgence, known as thebrahmajyoti. One may aspire to elevate himself to a heavenly planet within the material world, such as the moon, the sun or Venus, but if one is spiritually advanced in Kṛṣṇa consciousness, he does not wish to remain within the material universe, even in a higher planetary system. Rather, he prefers to penetrate the covering of the universe and attain the spiritual world.
(Sri Caitanya Caritamrta------2:6:230------purport).

Being the greatest authority, the Supreme Lord can easily allow many millions of living entities to merge into His body. The origin of everything is the Supreme Personality of Godhead, Bhagavān, and His bodily effulgence is known as the brahmajyoti, Brahmaloka or Siddhaloka. Thus Brahmaloka or Siddhaloka is a place where many sparklike living entities, parts and parcels of the Supreme Lord, are assembled. Because these living entities do not wish to keep their individual existences, they are combined and allowed to remain in Brahmaloka like so many atomic particles of sunshine emanating from the sun.
(Sri Caitanya Caritamrta------2:6:269------purport).

Everyone is searching for Kṛṣṇa in the different aspects of His manifestations. Kṛṣṇa, the Supreme Personality of Godhead, is partially realized in His impersonal brahma-jyotir effulgence and as the all-pervading Supersoul dwelling within everything, including the particles of atoms. But Kṛṣṇa is fully realized only by His pure devotees. Consequently, Kṛṣṇa is the object of everyone's realization, and thus anyone and everyone is satisfied according to one's desire to have Him. In the transcendental world also, Kṛṣṇa reciprocates with His pure devotees in the transcendental attitude, just as the devotee wants Him. One devotee may want Kṛṣṇa as supreme master, another as his personal friend, another as his son, and still another as his lover.
(Bhagavad-Gita-----4:11------purport).

The materially absorbed conditioned soul can be cured by Kṛṣṇa consciousness as set forth here in the Gītā. This process is generally known as yajña, or activities (sacrifices) simply meant for the satisfaction of Viṣṇu, or Kṛṣṇa. The more the activities of the material world are performed in Kṛṣṇa consciousness, or for Viṣṇu only, the more the atmosphere becomes spiritualized by complete absorption. The word brahma (Brahman) means "spiritual." The Lord is spiritual, and the rays of His transcendental body are called brahma-jyotir, His spiritual effulgence. Everything that exists is situated in that brahma-jyotir, but when the jyoti is covered by illusion (māyā) or sense gratification, it is called material.
(Bhagavad-Gita-----4:24------purport).

It is by great fortune that one comes to Kṛṣṇa consciousness on the path of bhakti-yoga to become well situated according to the Vedic direction. The ideal yogī concentrates his attention on Kṛṣṇa who is called Śyāmasundara, who is as beautifully colored as a cloud, whose lotuslike face is as effulgent as the sun, whose dress is brilliant with jewels and whose body is flower-garlanded. Illuminating all sides is His gorgeous luster, which is called the brahma-jyotir. He incarnates in different forms such as Rāma, Nṛsiṁha, Varāha and Kṛṣṇa, the Supreme Personality of Godhead, and He descends like a human being, as the son of mother Yaśodā, and He is known as Kṛṣṇa, Govinda and Vāsudeva. He is the perfect child, husband, friend and master, and He is full with all opulences and transcendental qualities. If one remains fully conscious of these features of the Lord, he is called the highest yogi.
(Bhagavad-Gita-----4:47------purport).

This material world is a temporary manifestation of one of the energies of the Lord. All the activities of the material world are directed by these three Viṣṇu expansions of Lord Kṛṣṇa. These puruṣas are called incarnations. Generally one who does not know the science of God (Kṛṣṇa) assumes that this material world is for the enjoyment of the living entities and that the living entities are the puruṣas—the causes, controllers and enjoyers of the material energy. According to Bhagavad-gītā this atheistic conclusion is false. In the verse under discussion it is stated that Kṛṣṇa is the original cause of the material manifestation. Śrīmad-Bhāgavatam also confirms this. The ingredients of the material manifestation are separated energies of the Lord. Even the brahma-jyotir, which is the ultimate goal of the impersonalists, is a spiritual energy manifested in the spiritual sky. There are no spiritual diversities in the brahma-jyotir as there are in the Vaikuṇṭhalokas, and the impersonalist accepts this brahma-jyotir as the ultimate eternal goal. The Paramātmā manifestation is also a temporary all-pervasive aspect of the Kṣīrodakaśāyī Viṣṇu. The Paramātmā manifestation is not eternal in the spiritual world. Therefore the factual Absolute Truth is the Supreme Personality of Godhead Kṛṣṇa. He is the complete energetic person, and He possesses different separated and internal energies.
(Bhagavad-Gita-----7:4------purport).

The light of the sun and the moon is also originally emanating from the brahma-jyotir, which is the impersonal effulgence of the Lord. And praṇava, or the oṁkāra transcendental sound in the beginning of every Vedic hymn, addresses the Supreme Lord. Because the impersonalists are very much afraid of addressing the Supreme Lord Kṛṣṇa by His innumerable names, they prefer to vibrate the transcendental sound oṁkāra. But they do not realize that oṁkāra is the sound representation of Kṛṣṇa. The jurisdiction of Kṛṣṇa consciousness extends everywhere, and one who knows Kṛṣṇa consciousness is blessed. Those who do not know Kṛṣṇa are in illusion, and so knowledge of Kṛṣṇa is liberation, and ignorance of Him is bondage.
(Bhagavad-Gita-----7:8------purport).

One who is attached to the impersonal feature of the Supreme Lord, the brahma-jyotir, is not described as mahātmā in the Bhagavad-gītā. He is described in a different way in the next verse. The mahātmā is always engaged in different activities of devotional service, as described in the Śrīmad-Bhāgavatam, hearing and chanting about Viṣṇu, not a demigod or human being. That is devotion: śravaṇaṁ kīrtanaṁ viṣṇoḥ and smaraṇam, remembering Him. Such a mahātmā has firm determination to achieve at the ultimate end the association of the Supreme Lord in any one of the five transcendental rasas. To achieve that success, he engages all activities—mental, bodily and vocal, everything—in the service of the Supreme Lord, Śrī Kṛṣṇa. That is called full Kṛṣṇa consciousness.
(Bhagavad-Gita-----9:14------purport).

This devotional service is just like a seed, and if it is sown in the heart of a living entity, and if he goes on hearing and chanting Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare, that seed fructifies, just as the seed of a tree fructifies with regular watering. The spiritual plant of devotional service gradually grows and grows until it penetrates the covering of the material universe and enters into the brahma-jyotir effulgence in the spiritual sky. In the spiritual sky also that plant grows more and more until it reaches the highest planet, which is called Goloka Vṛndāvana, the supreme planet of Kṛṣṇa. Ultimately, the plant takes shelter under the lotus feet of Kṛṣṇa and rests there. Gradually, as a plant grows fruits and flowers, that plant of devotional service also produces fruits, and the watering process in the form of chanting and hearing goes on. This plant of devotional service is fully described in the Caitanya-caritāmṛta (Madhya-līlā, Chapter Nineteen). It is explained there that when the complete plant takes shelter under the lotus feet of the Supreme Lord, one becomes fully absorbed in love of God; then he cannot live even for a moment without being in contact with the Supreme Lord, just as a fish cannot live without water. In such a state, the devotee actually attains the transcendental qualities in contact with the Supreme Lord.
(Bhagavad-Gita-----10:9------purport).

The word mat-paramaḥ refers to one who considers the association of Kṛṣṇa in His supreme abode to be the highest perfection of life. Such a person does not wish to be elevated to the higher planets such as the moon or sun or heavenly planets, or even the highest planet of this universe, Brahmaloka. He has no attraction for that. He is only attracted to being transferred to the spiritual sky. And even in the spiritual sky he is not satisfied with merging into the glowing brahma-jyotir effulgence, for he wants to enter the highest spiritual planet, namely Kṛṣṇaloka, Goloka Vṛndāvana. He has full knowledge of that planet, and therefore he is not interested in any other. As indicated by the word mad-bhaktaḥ, he fully engages in devotional service, specifically in the nine processes of devotional engagement: hearing, chanting, remembering, worshiping, serving the lotus feet of the Lord, offering prayers, carrying out the orders of the Lord, making friends with Him, and surrendering everything to Him. One can engage in all nine devotional processes, or eight, or seven, or at least in one, and that will surely make one perfect.
(Bhagavad-Gita-----11:55-----purport).

The Supersoul, the Supreme Personality of Godhead, is the source of light in all luminous objects like the sun, moon and stars. In the Vedic literature we find that in the spiritual kingdom there is no need of sun or moon, because the effulgence of the Supreme Lord is there. In the material world that brahma-jyotir, the Lord's spiritual effulgence, is covered by the mahat-tattva, the material elements; therefore in this material world we require the assistance of sun, moon, electricity, etc., for light. But in the spiritual world there is no need of such things. It is clearly stated in the Vedic literature that because of His luminous effulgence, everything is illuminated. It is clear, therefore, that His situation is not in the material world. He is situated in the spiritual world, which is far, far away in the spiritual sky. That is also confirmed in the Vedic literature. Āditya—varṇaṁ tamasaḥ parastāt (Śvetāśvatara Upaniṣad 3.8). He is just like the sun, eternally luminous, but He is far, far beyond the darkness of this material world.
(Bhagavad-Gita-----13:18-----purport).

Devotional service to the Lord is very simple: one should always engage in the service of the Lord, should eat the remnants of foodstuffs offered to the Deity, smell the flowers offered to the lotus feet of the Lord, see the places where the Lord had His transcendental pastimes, read of the different activities of the Lord, His reciprocation of love with His devotees, chant always the transcendental vibration Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare, and observe the fasting days commemorating the appearances and disappearances of the Lord and His devotees. By following such a process one becomes completely detached from all material activities. One who can thus situate himself in the brahma-jyotir or the different varieties of the Brahman conception is equal to the Supreme Personality of Godhead in quality.
(Bhagavad-Gita-----14:27-----purport).

In the Bhagavad-gītā (9.11) the Lord says that only the foolish take Him to be a mere human being. Such foolish men are not aware of His inconceivable energies. By His inconceivable energy He is present in everyone's heart, as the sun is present before everyone all over the world. The Paramātmā feature of the Lord is an expansion of His plenary portions. He expands Himself as Paramātmā in everyone's heart by His inconceivable energy, and He also expands Himself as the glowing effulgence of brahma-jyotir by expansion of His personal glow. It is stated in the Brahma-saṁhitā that the brahma-jyotir is His personal glow. Therefore, there is no difference between Him and His personal glow, brahma-jyotir, or His plenary portions as Paramātmā. Less intelligent persons who are not aware of this fact consider brahma-jyotir and Paramātmā to be different from Śrī Kṛṣṇa. This misconception of duality is completely removed from the mind of Bhīṣmadeva, and he is now satisfied that it is Lord Śrī Kṛṣṇa only who is all in all in everything. This enlightenment is attained by the great mahātmās or devotees, as it is stated in Bhagavad-gītā (7.19) that Vāsudeva is all in all in everything and that there is no existence of anything without Vāsudeva. Vāsudeva, or Lord Śrī Kṛṣṇa, is the original Supreme Person, as now confirmed by Bhīṣmadeva. Since Bhīṣmadeva is one of the twelve mahājanas, or great authorities, both the neophytes and the pure devotees must try to follow in his footsteps. That is the way of the devotional line.
(Srimad Bhagavatam------1:9:42------purport).

The worshipable object of Bhīṣmadeva is Lord Śrī Kṛṣṇa as Pārtha-sārathi, and that of the gopīs is the same Kṛṣṇa in Vṛndāvana as the most attractive Śyāmasundara. Sometimes less intelligent scholars make a mistake and think that the Kṛṣṇa of Vṛndāvana and that of the Battle of Kurukṣetra are different personalities. But for Bhīṣmadeva this misconception is completely removed. Even the impersonalist's object of destination is Kṛṣṇa as the impersonal jyoti, and the yogī's destination of Paramātmā is also Kṛṣṇa. Kṛṣṇa is bothbrahma-jyotir and localized Paramātmā, but brahma-jyotir and Paramātmā are not full representations of Kṛṣṇa. In Kṛṣṇa there are both brahma-jyotir and Paramātmā, but in brahma-jyotir or Paramātmā there is no Kṛṣṇa or sweet relations with Kṛṣṇa. In His personal feature Kṛṣṇa is both Pārtha-sārathi and Śyāmasundara of Vṛndāvana, but in His impersonal feature He is neither in the brahma-jyotir nor in the Paramātmā. Great mahātmās like Bhīṣmadeva realize all these different features of Lord Śrī Kṛṣṇa, and therefore they worship Lord Kṛṣṇa with one-pointed attention, knowing Him as the origin of all features.
(Srimad Bhagavatam------1:9:42------purport).

So the Vaikuṇṭha planets are factually the supreme residential places called the paraṁ padam. The impersonal brahma-jyotir is also called the paraṁ padam due to its being the rays of the Vaikuṇṭha planets, as the sun rays are the rays of the sun. In the Bhagavad-gītā (14.27) it is clearly said that the impersonal brahma-jyotir rests on the person of the Lord, and because everything rests on the brahma-jyotir directly and indirectly, everything is generated from the Lord, everything rests on Him, and after annihilation, everything is merged in Him only. Therefore, nothing is independent of Him. A pure devotee of the Lord no longer wastes valuable time in discriminating the Brahman from non-Brahman because he knows perfectly well that the Lord Para-brahman, by His Brahman energy, is interwoven in everything, and thus everything is looked upon by a devotee as the property of the Lord. The devotee tries to engage everything in His service and does not create perplexities by falsely lording it over the creation of the Lord. He is so faithful that he engages himself, as well as everything else, in the transcendental loving service of the Lord. In everything, the devotee sees the Lord, and he sees everything in the Lord. The specific disturbance created by a durātmā, or crooked soul, is due to his maintaining that the transcendental form of the Lord is something material.
(Srimad Bhagavatam------2:2:18------purport).

The primary practice of bhakti-yoga will cause the seed already sowed in heart to sprout, and by a regular watering process, as mentioned above, the bhakti-yoga creeper will begin to grow. By systematic nurturing, the creeper will grow to such an extent that it will penetrate the coverings of the universe, as we have heard in the previous verses, reach the effulgent sky, the brahma-jyotir, and go farther and farther and reach the spiritual sky, where there are innumerable spiritual planets called Vaikuṇṭhalokas. Above all of them is Kṛṣṇaloka, or Goloka Vṛndāvana, wherein the growing creeper enters and takes repose at the lotus feet of Lord Śrī Kṛṣṇa, the original Personality of Godhead. When one reaches the lotus feet of Lord Kṛṣṇa at Goloka Vṛndāvana, the watering process of hearing and reading, as also chanting of the holy name in the pure devotional stage, fructifies, and the fruits grown there in the form of love of God are tangibly tasted by the devotee, even though he is here in this material world. The ripe fruits of love of God are relished only by the devotees constantly engaged in the watering process as described above.
(Srimad Bhagavatam------2:2:30------purport).

The Supreme Personality of Godhead Lord Śrī Kṛṣṇa is described in the Bhagavad-gītā as puruṣottama, or the Supreme Personality. It is He only who can award liberation to the impersonalists by absorbing such aspirants in the brahma-jyotir, the bodily rays of the Lord. The brahma-jyotir is not separate from the Lord, as the glowing sun ray is not independent of the sun disc. Therefore one who desires to merge into the supreme impersonal brahma-jyotir must also worship the Lord by bhakti-yoga, as recommended here in the Śrīmad-Bhāgavatam. Bhakti-yoga is especially stressed here as the means of all perfection. In the previous chapters it has been stated that bhakti-yoga is the ultimate goal of both karma-yoga and jñāna-yoga, and in the same way in this chapter it is emphatically declared that bhakti-yoga is the ultimate goal of the different varieties of worship of the different demigods. Bhakti-yoga, thus being the supreme means of self-realization, is recommended here. Everyone must therefore seriously take up the methods of bhakti-yoga, even though one aspires for material enjoyment or liberation from material bondage.
(Srimad Bhagavatam------2:3:10------purport).

The Vaikuṇṭha planets and the Goloka Vṛndāvana planet are all self-illuminating, and the rays scattered by those sva-dhāma of the Lord constitute the existence of the brahma-jyotir. As further confirmed in the Vedas like the Muṇḍaka (2.2.10), Kaṭha (2.2.15) and Śvetāśvatara Upaniṣads (6.14):
na tatra sūryo bhāti na candra-tārakaṁ
nemā vidyuto bhānti kuto 'yam agniḥ
tam eva bhāntam anu bhāti sarvaṁ
tasya bhāsā sarvam idaṁ vibhāti
In the sva-dhāma of the Lord there is no need of sun, moon or stars for illumination. Nor is there need of electricity, so what to speak of ignited lamps? On the other hand, it is because those planets are self-illuminating that all effulgence has become possible, and whatever there is that is dazzling is due to the reflection of that sva-dhāma.
One who is dazzled by the effulgence of the impersonal brahma-jyotir cannot know the personal transcendence; therefore in the Īśopaniṣad (15) it is prayed that the Lord shift His dazzling effulgence so that the devotee can see the real reality.
(Srimad Bhagavatam------2:4:14------purport).

"I serve the Supreme Personality of Godhead Govinda, the primeval Lord, whose transcendental bodily effulgence, known as the brahma-jyotir, which is unlimited, unfathomed and all-pervasive, is the cause of the creation of unlimited numbers of planets, etc., with varieties of climates and specific conditions of life."
The same statement is in the Bhagavad-gītā (14.27). Lord Kṛṣṇa is the background of the brahma-jyotir (brahmaṇo hi pratiṣṭhāham). In the Nirukti, or Vedic dictionary, the import of pratiṣṭhā is mentioned as "that which establishes." So the brahma-jyotir is not independent or self-sufficient. Lord Śrī Kṛṣṇa is ultimately the creator of the brahma-jyotir, mentioned in this verse as sva-rociṣā, or the effulgence of the transcendental body of the Lord. This brahma-jyotir is all-pervading, and all creation is made possible by its potential power; therefore the Vedic hymns declare that everything that exists is being sustained by the brahma-jyotir (sarvaṁ khalv idaṁ brahma). Therefore the potential seed of all creation is the brahma-jyotir, and the same brahma-jyotir, unlimited and unfathomed, is established by the Lord. Therefore the Lord (Śrī Kṛṣṇa) is ultimately the supreme cause of all creation (ahaṁ sarvasya prabhavaḥ (B.G.10:8).
(Srimad Bhagavatam------2:5:11------purport).

One should not expect the Lord to create like a blacksmith with a hammer and other instruments. The Lord creates by His potencies. He has His multifarious potencies (parāsya śaktir vividhaiva śrūyate (Cc. Madhya 13.65, purport)). Just as the small seed of a banyan fruit has the potency to create a big banyan tree, the Lord disseminates all varieties of seeds by His potential brahma-jyotir (sva-rociṣā), and the seeds are made to develop by the watering process of persons like Brahmā. Brahmā cannot create the seeds, but he can manifest the seed into a tree, just as a gardener helps plants and orchards to grow by the watering process. The example cited here of the sun is very appropriate. In the material world the sun is the cause of all illumination: fire, electricity, the rays of the moon, etc. All luminaries in the sky are creations of the sun, the sun is the creation of the brahma-jyotir, and the brahma-jyotir is the effulgence of the Lord. Thus the ultimate cause of creation is the Lord.
(Srimad Bhagavatam------2:5:11------purport).

The universal form of the Lord, or the impersonal feature of the Lord known as the brahma-jyotir, is clearly explained here and compared to the radiation of the sun. The sunshine may expand all over the universe, but the source of the sunshine, namely the sun planet or the deity known as Sūrya-nārāyaṇa, is the basis of such radiation. Similarly, the Supreme Personality of Godhead Lord Kṛṣṇa is the basis of the impersonal brahma-jyotir radiation, or the impersonal feature of the Lord. This is confirmed in the Bhagavad-gītā (14.27). So the universal form of the Lord is the secondary imagination of the impersonal form of the Lord, but the primary form of the Lord is Śyāmasundara, with two hands, playing on His eternal flute.
(Srimad Bhagavatam------2:6:17------purport).

The fact is that the devotees who are always engaged in the devotional service of the Lord in transcendental love are rewarded many hundreds and thousands of times more than the demons by being elevated to the spiritual planets, where they remain with the Lord in eternal, blissful existence. The demons and impersonalists are awarded the facility of merging in the brahma-jyotir effulgence of the Lord, whereas the devotees are admitted into the spiritual planets. For comparison, one can just imagine the difference between floating in space and residing in one of the planets in the sky. The pleasure of the living entities on the planets is greater than that of those who have no body and who merge with the molecules of the sun's rays. The impersonalists, therefore, are no more favored than the enemies of the Lord; rather, they are both on the same level of spiritual salvation.
(Srimad Bhagavatam------3:2:24------purport).

Those who are associated with the Lord in the Vaikuṇṭha planets achieve all the bodily features of the Lord and appear to be the same as Lord Viṣṇu. Such liberation is called sārūpya-mukti, which is one of the five kinds of liberation. The devotees engaged in the transcendental loving service of the Lord never accept the sāyujya-mukti, or merging in the rays of the Lord called the brahma-jyotir. The devotees can achieve not only liberation but any success in the realm of religiosity, economic development or sense gratification up to the standard of the demigods in the heavenly planets. But such a pure devotee as Uddhava refuses to accept all such facilities. A pure devotee wants simply to engage in the service of the Lord and does not consider his own personal benefit.
(Srimad Bhagavatam------3:4:15------purport).

The devotee has only to hear about devotional activities, which are as simple as anything in ordinary life, and he also acts very simply, whereas the mental speculator has to pass through a jugglery of words, which are partially facts and partially a make-show for the maintenance of an artificial impersonal status. In spite of his strenuous efforts to attain perfect knowledge, the impersonalist attains merging into the impersonal oneness of the brahma-jyotir of the Lord, which is also attained by the enemies of the Lord simply because of their being killed by Him. The devotees, however, attain to the highest stage of knowledge and renunciation and achieve the Vaikuṇṭhalokas, the planets in the spiritual sky. The impersonalist attains only the sky, and does not achieve any tangible transcendental bliss, whereas the devotee attains to the planets where real spiritual life prevails. With a serious attitude, the devotee throws away all achievements like so much dust, and he accepts only devotional service, the transcendental culmination.
(Srimad Bhagavatam------3:5:46------purport).

In terms of a labor of love and its returns, the bhaktas, or devotees of the Lord, always have priority over persons who are addicted to the association of jñānīs, or impersonalists, and yogīs, or mystics. The word apare (others) is very significant in this connection. "Others" refers to the jñānīs and the yogīs, whose only hope is to merge into the existence of the impersonal brahma-jyotir. Although their destination is not so important in comparison to the destination of the devotees, the labor of the nondevotees is far greater than that of the bhaktas. One may suggest that there is sufficient labor for the devotees also in the matter of discharging devotional service. But that labor is compensated by the enhancement of transcendental pleasure. The devotees derive more transcendental pleasure while engaged continuously in the service of the Lord than when they have no such engagement. In the family combination of a man and a woman there is much labor and responsibility for both of them, yet when they are single they feel more trouble for want of their united activities.
(Srimad Bhagavatam------3:5:47------purport).

The only way to understand the Lord as He is, is by devotional service to the Lord, or by approaching the devotee of the Lord who always has the Lord in his heart. By devotional perfection one can understand that the impersonal brahma-jyotir is only a partial representation of the Supreme Personality of Godhead, Lord Kṛṣṇa, and that the three puruṣa expansions in the material creation are His plenary portions. In the spiritual sky of the brahma-jyotir there is no change of various kalpas or millenniums, and there are no creative activities in the Vaikuṇṭha worlds. The influence of time is conspicuous by its absence. The rays of the transcendental body of the Lord, the unlimited brahma-jyotir, are undeterred by the influence of material energy. In the material world also, the initial creator is the Lord Himself. He brings about the creation of Brahmā, who becomes the subsequent creator, empowered by the Lord.
(Srimad Bhagavatam------3:9:3------purport).

The path of devotional service is the most confidential means for attaining Brahman realization. That perfection in Brahman realization is attained through the auspicious path of devotional service indicates that the so-called Brahman realization, or realization of the brahma-jyotir effulgence, is not brahma-siddhi. Beyond that brahma-jyotir there is the Supreme Personality of Godhead. In the Upaniṣads a devotee prays to the Lord to kindly put aside the effulgence, brahma-jyotir, so that the devotee may see within the brahma-jyotirthe actual, eternal form of the Lord. Unless one attains realization of the transcendental form of the Lord, there is no question of bhakti. Bhakti necessitates the existence of the recipient of devotional service and the devotee who renders devotional service. Brahma-siddhi through devotional service is realization of the Supreme Personality of Godhead. The understanding of the effulgent rays of the body of the Supreme Godhead is not the perfect stage of brahma-siddhi, or Brahman realization. Nor is the realization of the Paramātmā feature of the Supreme Person perfect, for Bhagavān, the Supreme Personality of Godhead, is akhilātmā-He is the Supersoul. One who realizes the Supreme Personality realizes the other features, namely the Paramātmā feature and the Brahman feature, and that total realization is brahma-siddhi.
(Srimad Bhagavatam------3:25:19------purport).

The brahma-jyotir is actually the effulgence of the Supreme Personality of Godhead. As stated in Brahma-saṁhitā (5.40):
yasya prabhā prabhavato jagad-aṇḍa-koṭi-
koṭiṣv aśeṣa-vasudhādi-vibhūti-bhinnam
tad brahma niṣkalam anantam aśeṣa-bhūtaṁ
govindam ādi-puruṣaṁ tam ahaṁ bhajāmi
"I worship Govinda, the primeval Lord, who is endowed with great power. The glowing effulgence of His transcendental form is the impersonal Brahman, which is absolute, complete and unlimited and which displays the varieties of countless planets, with their different opulences, in millions and millions of universes." Although the impersonal feature of the Absolute is an expansion of the rays of the Supreme Personality of Godhead, He does not need to take care of the impersonalists who enter the brahma-jyotir. Kṛṣṇa says in Bhagavad-gītā (9.4), mayā tatam idaṁ sarvaṁ jagad avyakta-mūrtinā: "In My impersonal feature I pervade this entire universe." Thus the avyakta-mūrti, the impersonal feature, is certainly an expansion of Kṛṣṇa's energy.
(Srimad Bhagavatam------8:7:31------purport).

In the Brahmāṇḍa Purāṇa it is stated, "Those who have achieved liberation from material contamination and those who are demons and are killed by the Supreme Personality of Godhead become absorbed in the Brahman concept of life and reside in the spiritual sky of the brahmajyoti." That spiritual sky is far beyond the material sky, and it is confirmed also in Bhagavad-gītā that beyond this material sky there is another, eternal sky. The enemies and the impersonalists may be allowed to enter into this Brahman effulgence, but the devotees of Kṛṣṇa are promoted all the way to the spiritual planets.
(Nectar of Devotion).

The spiritual bodily effulgence of the Supreme Personality of Godhead, Kṛṣṇa, is called the brahmajyoti, and in that brahmajyoti there are countless planets. Just as within the sunshine there are innumerable planets, in the shining effulgence of the body of Kṛṣṇa there are innumerable planets and universes. We have knowledge of many universes, and in each universe there is a sun. Thus there are millions and billions of universes and millions and billions of suns and moons and planets. But Kṛṣṇa says that if one tries to go to one of these planets, he will simply waste his time.
(Easy journey to other Planets).

Arjuna then saw the effulgence of light known as the brahmajyoti. The brahmajyoti is situated outside the covering of the material universes, and because it cannot be seen with our present eyes, this brahmajyoti is sometimes called avyakta. This spiritual effulgence is the ultimate destination of the impersonalists known as Vedāntists. The brahmajyoti is also described as ananta-pāram, unlimited and unfathomed. When Lord Kṛṣṇa and Arjuna reached this region of the brahmajyoti, Arjuna could not tolerate the glaring effulgence, and he closed his eyes. Lord Kṛṣṇa's and Arjuna's reaching the brahmajyoti region is described in the Hari-vaṁśa. In that portion of the Vedic literature, Kṛṣṇa informs Arjuna, "My dear Arjuna, the glaring effulgence, the transcendental light you are seeing, is My bodily rays. O chief of the descendants of Bharata, this brahmajyoti is I Myself." As the sun disc and the sunshine cannot be separated, Kṛṣṇa and His bodily rays, the brahmajyoti, cannot be separated. Thus Kṛṣṇa claims that the brahmajyoti is He Himself. This is clearly stated in the Hari-vaṁśa, when Kṛṣṇa says ahaṁ saḥ. The brahmajyoti is a combination of the minute particles known as spiritual sparks, or the living entities, known as cit-kaṇa. The Vedic words so ’ham, or "I am the brahmajyoti," can also be applied to the living entities, who can also claim to belong to the brahmajyoti. In the Hari-vaṁśa, Kṛṣṇa further explains, "This brahmajyoti is an expansion of My spiritual energy."
(Krsna Book).

Kṛṣṇa told Arjuna, "The brahmajyoti is beyond the region of My external energy, known as māyā-śakti." When one is situated within the material world, it is not possible to experience this Brahman effulgence. In other words, in the material world this effulgence is not manifested, whereas in the spiritual world it is manifested. That is the purport of the words vyakta-avyakta in the Hari-vaṁśa. In the Bhagavad-gītā it is said, avyakto ’vyaktāt sanātanaḥ: both these energies are eternally manifested.
(Krsna Book).

In the Bhagavad-gītā (14.27), the Lord explains His personal rays (brahmajyoti), the dazzling effulgence of His personal form, in this way:
brahmaṇo hi pratiṣṭhāham
amṛtasyāvyayasya ca
śāśvatasya ca dharmasya
sukhasyaikāntikasya ca
"I am the basis of the impersonal Brahman, which is immortal, imperishable and eternal and is the constitutional position of ultimate happiness." Brahman, Paramātmā and Bhagavān are three aspects of the same Absolute Truth. Brahman is the aspect most easily perceived by the beginner; Paramātmā, the Supersoul, is realized by those who have further progressed; and Bhagavān realization is the ultimate realization of the Absolute Truth. This is confirmed in the Bhagavad-gītā (7.7), where Lord Kṛṣṇa says that He is the ultimate concept of the Absolute Truth: mattaḥ parataraṁ nānyat. Therefore Kṛṣṇa is the source of the brahmajyoti as well as the all-pervading Paramātmā.
(Sri Isopanishad).