As soon as a devotee is inspired by the Lord to offer the Lord a prayer, the devotee immediately glorifies the Lord in the beginning by saying, "All glories unto You, my Lord." The Lord is glorified because He is considered to be the chief of all self-realized souls. As said in the Vedas (Kaṭha Upaniṣad 2.2.13), nityo nityānāṁ cetanaś cetanānām: the Supreme Being, the Personality of Godhead, is the chief living being amongst all living beings. There are different kinds of individual living beings—some of them are in this material world, and some are in the spiritual world. Those who are in the spiritual world are known to be completely self-realized because on the spiritual platform the living entity is not forgetful of his service to the Lord. Therefore in the spiritual world all those who are in the devotional service of the Lord are eternally fixed, for they understand the position of the Supreme Being, as well as their individual constitution. Thus amongst self-realized souls, the Lord is known as the perfectly self-realized soul. Nityo nityānāṁ cetanaś cetanānām (Kaṭha Upaniṣad 2.2.13). When the individual soul is fixed in his knowledge of the Lord as the Supreme Being, he actually becomes established in an all-auspicious position. Lord Śiva prays herein that his auspicious position continue eternally by virtue of the Lord's mercy upon him.
(Srimad Bhagavatam-----4:24:33-----purport).

Thus if one desires to enter into the spiritual world, he must try to understand the Supreme Personality of Godhead by practicing bhakti-yoga. Simply by practicing bhakti-yoga one can understand the Supreme Lord in truth, but without such understanding, one cannot enter the spiritual kingdom. One may be elevated to the heavenly planets or may realize himself as Brahman (ahaṁ brahmāsmi), but that is not the end of realization. One must realize the position of the Supreme Personality of Godhead by bhakti-yoga; then real perfection of life is attained.
(Srimad Bhagavatam-----4:24:54-----purport).

The original home of the living entity and the Supreme Personality of Godhead is the spiritual world. In the spiritual world both the Lord and the living entities live together very peacefully. Since the living entity remains engaged in the service of the Lord, they both share a blissful life in the spiritual world. However, when the living entity wants to enjoy himself, he falls down into the material world. Even while he is in that position, the Lord remains with him as the Supersoul, his intimate friend. Because of his forgetfulness, the living entity does not know that the Supreme Lord is accompanying him as the Supersoul. In this way the living entity remains conditioned in each and every millennium. Although the Lord follows him as a friend, the living entity, because of forgetful material existence, does not recognize Him.
(Srimad Bhagavatam-----4:28:54-----purport).

As the dog of a rich man, he will live very opulently. Sometimes in Western countries we hear of a master leaving millions of dollars to a dog in his will. Of course, there are many dogs loitering in the street without food. Therefore, to liken the conditional existence of the living entity to that of a dog is very appropriate. An intelligent human being, however, can understand that if he has to live the life of a dog, he had best become Kṛṣṇa's dog. In the material world a dog is sometimes elevated and is sometimes on the street, but in the spiritual world, Kṛṣṇa's dog is perpetually, eternally happy. Śrīla Bhaktivinoda Ṭhākura has therefore sung: vaiṣṇava ṭhākura tomāra kukura baliyā jānaha more. In this way Bhaktivinoda Ṭhākura offers to become a Vaiṣṇava's dog. A dog always keeps himself at his master's door and does not allow any person unfavorable to the master to enter. Similarly, one should engage in the service of a Vaiṣṇava and try to please him in every respect. Unless one does so, he does not make spiritual advancement. Apart from spiritual advancement, in the material world if one does not develop his qualities in goodness, he cannot be promoted to the higher planetary system.
(Srimad Bhagavatam-----4:29:30-31-----purport).

The pārijāta tree is not commonly found within this material world. The pārijāta tree is also known as kalpa-vṛkṣa, or the wish-fulfilling tree. One can get anything he desires from such a tree. In the material world, one can get oranges from an orange tree or mangoes from a mango tree, but there is no possibility of getting oranges from a mango tree or vice versa. However, one can get whatever he wants from the pārijāta tree—oranges, mangoes, bananas and so on. This tree is found in the spiritual world. Cintāmaṇi-prakara-sadmasu kalpa-vṛkṣa-lakṣāvṛteṣu (Bs. 5.29). The spiritual world, cintāmaṇi-dhāma, is surrounded by these kalpa-vṛkṣa trees, but the pārijāta tree is also found in the kingdom of Indra, that is, on Indra's heavenly planet. This pārijāta tree was brought by Kṛṣṇa to please Satyabhāmā, one of His queens, and this tree was implanted in the Dvārakā mansions constructed for the queens. The lotus feet of the Lord are exactly like the pārijāta trees, or wish-fulfilling trees, and the devotees are like bumblebees. They are always attracted by the lotus feet of the Lord.
(Srimad Bhagavatam-----4:30:32-----purport).

As confirmed in the Vedic literatures, tad-vijñānārthaṁ sa gurum evābhigacchet: (MU 1.2.12) one has to search out a guru to understand the affairs of the spiritual world. Śrīmad-Bhāgavatam also confirms this point. Tasmād guruṁ prapadyeta jijñāsuḥ śreya uttamam: (S.B.11:3:21) one who is very interested in understanding the activities in the spiritual world must search out a guru—a bona fide representative of Kṛṣṇa. From all angles of vision, therefore, the word guru is especially meant for the bona fide representative of Kṛṣṇa and no one else. Padma Purāṇa states, avaiṣṇavo gurur na syāt: one who is not a Vaiṣṇava, or who is not a representative of Kṛṣṇa, cannot be a guru. Even the most qualified brāhmaṇa cannot become a guru if he is not a representative of Kṛṣṇa. Brāhmaṇas are supposed to acquire six kinds of auspicious qualifications: they become very learned scholars (paṭhana) and very qualified teachers (pāṭhana); they become expert in worshiping the Lord or the demigods (yajana), and they teach others how to execute this worship (yājana); they qualify themselves as bona fide persons to receive alms from others (pratigraha), and they distribute the wealth in charity (dāna).
(Srimad Bhagavatam-----5:17:11-----purport).

Another point in this verse is that in all eight of these heavenly varṣas, although men and women enjoy sex pleasure, there is no pregnancy. Pregnancy takes place only in lower-grade life. For example, animals like dogs and hogs become pregnant twice a year, and each time they beget at least half a dozen offspring. Even lower species of life such as snakes give birth to hundreds of young at one time. This verse informs us that in grades of life higher than ours, pregnancy occurs once in a lifetime. People still have sex life, but there is no pregnancy. In the spiritual world, people are not very attracted to sex life, due to their exalted devotional attitude. Practically speaking, there is no sex life in the spiritual world, but even if sometimes it does occur, there is no pregnancy at all. On the planet earth, however, human beings do become pregnant, although the tendency is to avoid having children. In this sinful age of Kali, people have even taken to the process of killing the child in the womb. This is the most degraded practice; it can only perpetuate the miserable material conditions of those who perform it.
(Srimad Bhagavatam-----5:17:12-----purport).

In this connection, Viśvanātha Cakravartī Ṭhākura informs us that the demigods worship the Supreme Lord in His various Deity forms (arcā-vigraha) because exceptin the spiritual world, the Supreme Personality of Godhead cannot be directly worshiped in person. In the material world, the Lord is always worshiped as the arcā-vigraha, or Deity in the temple. There is no difference between the arcā-vigraha and the original person, and therefore those who are engaged in worshiping the Deity in the temple in full opulence, even on this planet, should be understood to be directly in touch with the Supreme Personality of Godhead without a doubt. As enjoined in the śāstras, arcye viṣṇau śilā-dhīr guruṣu nara-matiḥ: "No one should treat the Deity in the temple as stone or metal, nor should one think that the spiritual master is an ordinary human being." One should strictly follow this śāstric injunction and worship the Deity, the Supreme Personality of Godhead, without offenses. The spiritual master is the direct representative of the Lord, and no one should consider him an ordinary human being. By avoiding offenses against the Deity and the spiritual master, one can advance in spiritual life, or Kṛṣṇa consciousness.
(Srimad Bhagavatam-----5:17:14-----purport).

"In the Padma Purāṇa it is said that in the spiritual world the Lord personally expands in all directions and is worshiped as Vāsudeva, Saṅkarṣaṇa, Pradyumna and Aniruddha. The same God is represented by the Deity in this material world, which is only one quarter of His creation. Vāsudeva, Saṅkarṣaṇa, Pradyumna and Aniruddha are also present in the four directions of this material world. There is a Vaikuṇṭhaloka covered with water in this material world, and on that planet is a place called Vedavatī, where Vāsudeva is located. Another planet known as Viṣṇuloka is situated above Satyaloka, and there Saṅkarṣaṇa is present. Similarly, in Dvārakā-purī, Pradyumna is the predominator. On the island known as Śvetadvīpa, there is an ocean of milk, and in the midst of that ocean is a place called Airāvatī-pura, where Aniruddha lies on Ananta. In some of the sātvata-tantras, there is a description of the nine varṣas and the predominating Deity worshiped in each: (1) Vāsudeva, (2) Saṅkarṣaṇa, (3) Pradyumna, (4) Aniruddha, (5) Nārāyaṇa, (6) Nṛsiṁha, (7) Hayagrīva, (8) Mahāvarāha, and (9) Brahmā." The Lord Brahmā mentioned in this connection is the Supreme Personality of Godhead. When there is no fit human being to empower as Lord Brahmā, the Lord Himself takes the position of Lord Brahmā. Tatra brahmā tu vijñeyaḥ pūrvokta-vidhayā hariḥ. That Brahmā mentioned here is Hari Himself.
(Srimad Bhagavatam-----5:17:14-----purport).

Although crocodiles are very fierce animals, they are powerless when they venture out of the water onto land. When they are out of the water, they cannot exhibit their original power. Similarly, the all-pervading Supersoul, Paramātmā, is the source of all living entities, and all living entities are part and parcel of Him. When the living entity remains in contact with the all-pervading Vāsudeva, the Personality of Godhead, he manifests his spiritual power, exactly as the crocodile exhibits its strength in the water. In other words, the greatness of the living entity can be perceived when he is in the spiritual world, engaged in spiritual activities. Many householders, although well-educated in the knowledge of the Vedas, become attached to family life. They are compared herein to crocodiles out of water, for they are devoid of all spiritual strength. Their greatness is like that of a young husband and wife who, though uneducated, praise one another and become attracted to their own temporary beauty. This kind of greatness is appreciated only by low-class men with no qualifications.
(Srimad Bhagavatam-----5:18:13-----purport).

In the Brahma-saṁhitā it is said, goloka eva nivasaty akhilātma-bhūtaḥ: (Bs. 5.37) the Lord always remains in Goloka, the topmost planet in the spiritual world. At the same time, He is all-pervading. This paradox is only possible for the Supreme Personality of Godhead, who is full of all opulences. The Lord's all-pervasiveness is confirmed in Bhagavad-gītā (18.61) where Kṛṣṇa states, īśvaraḥ sarva-bhūtānāṁ hṛd-deśe 'rjuna tiṣṭhati: "The Supreme Lord is seated in everyone's heart, O Arjuna." Elsewhere in Bhagavad-gītā (15.15) the Lord says, sarvasya cāhaṁ hṛdi sanniviṣṭo mattaḥ smṛtir jñānam apohanaṁ ca: "I am seated in everyone's heart, and from Me come remembrance, knowledge and forgetfulness." Therefore, although the Lord is present everywhere, He cannot be seen with ordinary eyes. As Aryamā says, the Lord is anupalakṣita-sthāna: no one can locate Him. This is the greatness of the Supreme Personality of Godhead.
(Srimad Bhagavatam-----5:18:30-----purport).