There are three degrees of covering of the living entity by which his pure consciousness is obscured. This covering is but lust under different manifestations like smoke in the fire, dust on the mirror, and the womb about the embryo. When lust is compared to smoke, it is understood that the fire of the living spark can be a little perceived. In other words, when the living entity exhibits his Kṛṣṇa consciousness slightly, he may be likened to the fire covered by smoke. Although fire is necessary where there is smoke, there is no overt manifestation of fire in the early stage. This stage is like the beginning of Kṛṣṇa consciousness. The dust on the mirror refers to a cleansing process of the mirror of the mind by so many spiritual methods. The best process is to chant the holy names of the Lord. The embryo covered by the womb is an analogy illustrating a helpless position, for the child in the womb is so helpless that he cannot even move. This stage of living condition can be compared to that of the trees. The trees are also living entities, but they have been put in such a condition of life by such a great exhibition of lust that they are almost void of all consciousness. The covered mirror is compared to the birds and beasts, and the smoke-covered fire is compared to the human being. In the form of a human being, the living entity may revive a little Kṛṣṇa consciousness, and, if he makes further development, the fire of spiritual life can be kindled in the human form of life. By careful handling of the smoke in the fire, fire can be made to blaze. Therefore the human form of life is a chance for the living entity to escape the entanglement of material existence. In the human form of life, one can conquer the enemy, lust, by cultivation of Kṛṣṇa consciousness under able guidance.
(Bhagavad-Gita----3:38----purport).

As stated in the Vedas (Puruṣa-bodhinī Upaniṣad):
eko devo nitya-līlānurakto
bhakta-vyāpī hṛdy antar-ātmā
"The one Supreme Personality of Godhead is eternally engaged in many, many transcendental forms in relationships with His unalloyed devotees." This Vedic version is confirmed in this verse of the Gītā personally by the Lord. He who accepts this truth on the strength of the authority of the Vedas and of the Supreme Personality of Godhead and who does not waste time in philosophical speculations attains the highest perfectional stage of liberation. Simply by accepting this truth on faith, one can, without a doubt, attain liberation. The Vedic version tat tvam asi is actually applied in this case. Anyone who understands Lord Kṛṣṇa to be the Supreme, or who says unto the Lord "You are the same Supreme Brahman, the Personality of Godhead," is certainly liberated instantly, and consequently his entrance into the transcendental association of the Lord is guaranteed. In other words, such a faithful devotee of the Lord attains perfection, and this is confirmed by the following Vedic assertion:
tam eva viditvāti mṛtyum eti
nānyaḥ panthā vidyate 'yanāya
"One can attain the perfect stage of liberation from birth and death simply by knowing the Lord, the Supreme Personality of Godhead, and there is no other way to achieve this perfection." (Śvetāśvatara Upaniṣad 3.8) That there is no alternative means that anyone who does not understand Lord Kṛṣṇa as the Supreme Personality of Godhead is surely in the mode of ignorance and consequently he will not attain salvation simply, so to speak, by licking the outer surface of the bottle of honey, or by interpreting the Bhagavad-gītā according to mundane scholarship. Such empiric philosophers may assume very important roles in the material world, but they are not necessarily eligible for liberation. Such puffed-up mundane scholars have to wait for the causeless mercy of the devotee of the Lord. One should therefore cultivate Kṛṣṇa consciousness with faith and knowledge, and in this way attain perfection.
(Bhagavad-Gita----4:9----purport).

All kinds of yogīs-karma, jñāna, haṭha, etc.—eventually have to attain devotional perfection in bhakti-yoga, or Kṛṣṇa consciousness, before they can go to Kṛṣṇa's transcendental abode and never return. Those who attain the highest material planets, the planets of the demigods, are again subjected to repeated birth and death. As persons on earth are elevated to higher planets, people on higher planets such as Brahmaloka, Candraloka and Indraloka fall down to earth. The practice of sacrifice called pañcāgni-vidyā, recommended in the Chāndogya Upaniṣad, enables one to achieve Brahmaloka, but if, on Brahmaloka, one does not cultivate Kṛṣṇa consciousness, then he must return to earth. Those who progress in Kṛṣṇa consciousness on the higher planets are gradually elevated to higher and higher planets and at the time of universal devastation are transferred to the eternal spiritual kingdom. Baladeva Vidyābhūṣaṇa, in his commentary on Bhagavad-gītā, quotes this verse:
brahmaṇā saha te sarve
samprāpte pratisañcare
parasyānte kṛtātmānaḥ
praviśanti paraṁ padam
"When there is devastation of this material universe, Brahmā and his devotees, who are constantly engaged in Kṛṣṇa consciousness, are all transferred to the spiritual universe and to specific spiritual planets according to their desires."
(Bhagavad-Gita----8:16----purport).

Control of the senses means that the senses should not be used for unnecessary personal enjoyment. There is no prohibition against meeting the proper needs of the senses, but unnecessary sense enjoyment is detrimental for spiritual advancement. Therefore the senses should be restrained from unnecessary use. Similarly, one should restrain the mind from unnecessary thoughts; that is called śama. One should not spend one's time pondering over earning money. That is a misuse of the thinking power. The mind should be used to understand the prime necessity of human beings, and that should be presented authoritatively. The power of thought should be developed in association with persons who are authorities in the scriptures, saintly persons and spiritual masters and those whose thinking is highly developed. Sukham, pleasure or happiness, should always be in that which is favorable for the cultivation of the spiritual knowledge of Kṛṣṇa consciousness. And similarly, that which is painful or which causes distress is that which is unfavorable for the cultivation of Kṛṣṇa consciousness. Anything favorable for the development of Kṛṣṇa consciousness should be accepted, and anything unfavorable should be rejected.
(Bhagavad-Gita----10:4-5----purport).

Savya-sācin refers to one who can shoot arrows very expertly in the field; thus Arjuna is addressed as an expert warrior capable of delivering arrows to kill his enemies. "Just become an instrument": nimitta-mātram. This word is also very significant. The whole world is moving according to the plan of the Supreme Personality of Godhead. Foolish persons who do not have sufficient knowledge think that nature is moving without a plan and all manifestations are but accidental formations. There are many so-called scientists who suggest that perhaps it was like this, or maybe like that, but there is no question of "perhaps" and "maybe." There is a specific plan being carried out in this material world. What is this plan? This cosmic manifestation is a chance for the conditioned souls to go back to Godhead, back to home. As long as they have the domineering mentality which makes them try to lord it over material nature, they are conditioned. But anyone who can understand the plan of the Supreme Lord and cultivate Kṛṣṇa consciousness is most intelligent. The creation and destruction of the cosmic manifestation are under the superior guidance of God. Thus the Battle of Kurukṣetra was fought according to the plan of God. Arjuna was refusing to fight, but he was told that he should fight in accordance with the desire of the Supreme Lord. Then he would be happy. If one is in full Kṛṣṇa consciousness and his life is devoted to the Lord's transcendental service, he is perfect.
(Bhagavad-Gita----11:33----purport).

The child prays that it is better to remain within the womb of darkness and be constantly absorbed in Kṛṣṇa consciousness than to get out and again fall a victim to the illusory energy. The illusory energy acts within the abdomen as well as outside the abdomen, but the trick is that one should remain Kṛṣṇa conscious, and then the effect of such a horrible condition cannot act unfavorably upon him. In Bhagavad-gītā it is said that one's intelligence is his friend, and the same intelligence can also be his enemy. Here also the same idea is repeated: suhṛdātmanaiva, friendly intelligence. Absorption of intelligence in the personal service of Kṛṣṇa and full consciousness of Kṛṣṇa always are the path of self-realization and liberation. Without being unnecessarily agitated, if we take to the process of Kṛṣṇa consciousness by constantly chanting Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare, the cycle of birth and death can be stopped for good. It may be questioned herein how the child can be fully Kṛṣṇa conscious within the womb of the mother without any paraphernalia with which to execute Kṛṣṇa consciousness. It is not necessary to arrange for paraphernalia to worship the Supreme Personality of Godhead, Viṣṇu. The child wants to remain within the abdomen of its mother and at the same time wants to become free from the clutches of māyā. One does not need any material arrangement to cultivate Kṛṣṇa consciousness. One can cultivate Kṛṣṇa consciousness anywhere and everywhere, provided he can always think of Kṛṣṇa. The mahā-mantra, Hare Kṛṣṇa, Hare Kṛṣṇa, Kṛṣṇa Kṛṣṇa, Hare Hare/ Hare Rāma, Hare Rāma, Rāma Rāma, Hare Hare, can be chanted even within the abdomen of one's mother. One can chant while sleeping, while working, while imprisoned in the womb or while outside. This Kṛṣṇa consciousness cannot be checked in any circumstance. The conclusion of the child's prayer is: "Let me remain in this condition; although it is very miserable, it is better not to fall a victim to māyā again by going outside."
(Srimad Bhagavatam----3:31:21----purport).

The mission of the appearance of the Supreme Personality of Godhead in the form of Kapila was to distribute the transcendental knowledge of Sāṅkhya philosophy, which is full of devotional service. Having imparted that knowledge to His mother—and, through His mother, to the world—Kapiladeva had no more need to stay at home, so He took permission from His mother and left. Apparently He left home for spiritual realization, although He had nothing to realize spiritually because He Himself is the person to be spiritually realized. Therefore this is an example set by the Supreme Personality of Godhead while acting like an ordinary human being so that others might learn from Him. He could, of course, have stayed with His mother, but He indicated that there was no need to stay with the family. It is best to remain alone as a brahmacārī, sannyāsī or vānaprastha and cultivate Kṛṣṇa consciousnessthroughout one's whole life. Those who are unable to remain alone are given license to live in household life with wife and children, not for sense gratification but for cultivation of Kṛṣṇa consciousness.
(Srimad Bhagavatam----3:33:12----purport).

The cultivation of Kṛṣṇa consciousness is possible where great devotees live together and constantly engage in hearing and chanting the glories of the Lord. In a holy place like Vṛndāvana, there are many devotees constantly engaged in chanting and hearing the glories of the Lord. If one gets the chance to hear from pure devotees in such a place, allowing the constant flow of the river of nectar to come from the mouths of pure devotees, then the cultivation of Kṛṣṇa consciousness becomes very easy. When one is engaged in constantly hearing the glories of the Lord, he certainly rises above the bodily conception. When one is in the bodily conception, he feels the pangs of hunger and thirst, fear, lamentation and illusion. But when one is engaged in hearing and chanting the glories of the Lord, he transcends the bodily conception. The word bhagavad-guṇānukathana-śravaṇa-vyagra-cetasaḥ, meaning "always eager to find the place where the glories of the Lord are being heard and chanted," is significant in this verse. A businessman is always very eager to go to a place where business is transacted. Similarly, a devotee is very eager to hear from the lips of liberated devotees. As soon as one hears the glories of the Lord from the liberated devotees, he immediately becomes impregnated with Kṛṣṇa consciousness.
(Srimad Bhagavatam----4:29:39-40----purport).

In the association of pure devotees, one becomes attached to hearing and chanting the glories of the Lord. In this way one can cultivate Kṛṣṇa consciousness, and as soon as this cultivation is advanced, one can become faithful to the Lord, devoted to the Lord and attached to the Lord, and thus one can very quickly attain full Kṛṣṇa consciousness. The secret of success in the cultivation of Kṛṣṇa consciousness is hearing from the right person. A Kṛṣṇa conscious person is never disturbed by the bodily necessities—namely eating, sleeping, mating and defending.
(Srimad Bhagavatam----4:29:39-40----purport).

Unless one is associated with devotees, he cannot cultivate Kṛṣṇa consciousness. Nirjana-bhajana—cultivating Kṛṣṇa consciousness in a solitary place—is not possible for the neophyte, for he will be disturbed by the bodily necessities (eating, sleeping, mating and defending). Being so disturbed, one cannot cultivate Kṛṣṇa consciousness. We therefore see that devotees known as sahajiyā, who make everything very easy, do not associate with advanced devotees. Such persons, in the name of devotional activities, are addicted to all kinds of sinful acts—illicit sex, intoxication, gambling and meat-eating. There are many so-called devotees passing themselves off as devotees while engaging in these sinful activities. In other words, one who is influenced by sinful activity cannot be accepted as a person in Kṛṣṇa consciousness. A person addicted to sinful life cannot develop Kṛṣṇa consciousness, as indicated in this verse.
(Srimad Bhagavatam----4:29:41----purport).

The symptoms of pure devotees are described in this verse. The pure devotee is never interested in material topics. Śrī Caitanya Mahāprabhu has strictly prohibited His devotees to talk about worldly matters. Grāmya-vārtā nā kahibe: [Cc. Antya 6.236] one should not indulge in talking unnecessarily about news of the material world. One should not waste time in this way. This is a very important feature in the life of a devotee. A devotee has no other ambition than to serve Kṛṣṇa, the Supreme Personality of Godhead. This Kṛṣṇa consciousness movement was started to engage people twenty-four hours daily in the service of the Lord and in His glorification. The students in this institution engage in the cultivation of Kṛṣṇa consciousness from five in the morning to ten at night. They actually have no opportunity to waste their time unnecessarily by discussing politics, sociology and current events. These will go their own way. A devotee is concerned only with serving Kṛṣṇa positively and seriously.
(Srimad Bhagavatam----5:12:13----purport).

Simply by associating with exalted devotees, anyone can attain perfection of knowledge and with the sword of knowledge can cut to pieces the illusory associations within this material world. Through the association of devotees, one can engage in the service of the Lord by hearing and chanting [śravaṇaṁ kīrtanam]. Thus one can revive his dormant Kṛṣṇa consciousness and, sticking to the cultivation of Kṛṣṇa consciousness, return home, back to Godhead, even in this life.
To become liberated from material bondage, one must give up the association of worldly people and accept the association of devotees, positive and negative processes are mentioned in this regard. Through the association of devotees, one develops Kṛṣṇa consciousness, which is dormant within. This Kṛṣṇa consciousness movement is giving this chance to everyone. We are giving shelter to everyone who is serious about progressing in Kṛṣṇa consciousness. We arrange for their lodging and board so that they can peacefully cultivate Kṛṣṇa consciousness and return home, back to Godhead, even in this life.
(Srimad Bhagavatam----5:12:16----translation and purport).

The name of God is Kṛṣṇa, because He is so attractive that the pure devotee can give up everything within this material world on His behalf. Mahārāja Bharata was an ideal king, instructor and emperor of the world. He possessed all the opulences of the material world, but Kṛṣṇa is so attractive that He attracted Mahārāja Bharata from all his material possessions. Yet somehow or other, the King became affectionate to a little deer and, falling from his position, had to accept the body of a deer in his next life. Due to Kṛṣṇa's great mercy upon him, he could not forget his position, and he could understand how he had fallen. Therefore in the next life, as Jaḍa Bharata, Mahārāja Bharata was careful not to spoil his energy, and therefore he presented himself as a deaf and dumb person. In this way he could concentrate on his devotional service. We have to learn from the great King Bharata how to become cautious in cultivating Kṛṣṇa consciousness. A little inattention will retard our devotional service for the time being. Yet any service rendered to the Supreme Personality of Godhead is never lost: svalpam apy asya dharmasya trāyate mahato bhayāt (Bg. 2.40). A little devotional service rendered sincerely is a permanent asset.
(Srimad Bhagavatam----5:14:43----purport).

It is certainly as a result of pious activities that one takes birth in the heavenly planets, but from those planets one must nevertheless come down again to earth, as stated in Bhagavad-gītā (kṣīṇe puṇye martya-lokaṁ viśanti [Bg. 9.21]). Even the demigods must return to earth to work like ordinary men when the results of their pious activities expire. Nevertheless, the demigods desire to come to the land of Bhārata-varṣa if even a small portion of the merits of their pious activities remains. In other words, to take birth in Bhārata-varṣa, one must perform more pious activities than the demigods. In Bhārata-varṣa one is naturally Kṛṣṇa conscious, and if one further cultivates his Kṛṣṇa consciousness, by the grace of Kṛṣṇa he certainly expands his good fortune by becoming perfect in Kṛṣṇa consciousness and very easily going back home, back to Godhead. In many other places in the Vedic literature it is found that even the demigods want to come to this land of Bhārata-varṣa. A foolish person may desire to be promoted to the heavenly planets as a result of his pious activities, but even the demigods from the heavenly planets want to come to Bhārata-varṣa and achieve bodies that may be very easily used to cultivate Kṛṣṇa consciousness.
(Srimad Bhagavatam----5:19:28----purport).

Śrīla Rūpa Gosvāmī has described the finest pattern of devotional service as ānukūlyena kṛṣṇānuśīlanam [Cc. Madhya 19.167], or cultivating Kṛṣṇa consciousnessfavorably. Kaṁsa, of course, was also Kṛṣṇa conscious, but because he regarded Kṛṣṇa as his enemy, even though he was fully absorbed in Kṛṣṇa consciousness, his Kṛṣṇa consciousness was not favorable for his existence. Kṛṣṇa consciousness, favorably cultivated, makes one completely happy, so much so that a Kṛṣṇa conscious person does not consider kaivalya-sukham, or merging into the existence of Kṛṣṇa, to be a great gain.
(Srimad Bhagavatam----10:2:24----purport).