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On the Way to Kṛṣṇa
literatures give us information that there are countless planets filled with living entities with different types of bodies. As, by making some material adjustment, we may qualify to enter into different material planets, by qualification we can enter into the spiritual planet where the Supreme Lord resides.
yānti deva-vratā devān 
    pitṛn yānti pitṛ-vratāḥ 
    bhūtāni yānti bhūtejyā 
    yānti mad-yājino' pi mām
“Those who worship the demigods will take birth among the demigods; those who worship ancestors go to the ancestors; and those who worship Me will live with Me.” (Bg. 9.25)
Those who are trying to enter higher planets can go there, and those who are trying to qualify to enter into Goloka Vṛndāvana, the planet of Kṛṣṇa, can also enter there by the process of Kṛṣṇa consciousness. Before going to India, we may acquire a description of what the country is like; the hearing of a place is the first experience. Similarly, if we want to get information about the planet where God lives, we have to hear. We cannot immediately make an experiment and go there. That is not possible. But we have so many descriptions of the supreme planet in Vedic literature. For instance, the  Brahma-saṁhitā  states:
cintāmaṇi-prakara-sadmasu kalpa-vṛkṣa- 
    lakṣāvṛteṣu surabhīr abhipālayantam 
    lakṣmī-sahasra-śata-sambhrama-sevyamānam 
    govindam ādi-puruṣaṁ tam ahaṁ bhajāmi