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…The Lord descends to this mortal world to show His pastimes in Vṛndāvana, which are full of happiness. When Lord Śrī Kṛṣṇa was in Vṛndāvana, His activities with His cowherd boy friends, with His damsel friends, with the inhabitants of Vṛndāvana and with the cows were all full of happiness. The total population of Vṛndāvana knew nothing but Kṛṣṇa. But Lord Kṛṣṇa even discouraged His father Nanda Mahārāja from worshiping the demigod Indra because He wanted to establish the fact that people need not worship any demigod. They need only worship the Supreme Lord because their ultimate goal is to return to His abode. (from Introduction to the Bhagavad-gita As It Is)
The abode of Lord Śrī Kṛṣṇa is described in the Bhagavad-gītā, Fifteenth Chapter, sixth verse:
na tad bhāsayate sūryo na śaśāṅko na pāvakaḥ
yad gatvā na nivartante tad dhāma paramaṁ mama
“That abode of Mine is not illumined by the sun or moon, nor by electricity. And anyone who reaches it never comes back to this material world.” (Bg. 15.6)
This verse gives a description of that eternal sky. Of course we have a material conception of the sky, and we think of it in relationship to the sun, moon, stars and so on, but in this verse the Lord states that in the eternal sky there is no need for the sun nor for the moon nor fire of any kind because the spiritual sky is already illuminated by the brahmajyoti, the rays emanating from the Supreme Lord. We are trying with difficulty to reach other planets, but it is not difficult to understand the abode of the Supreme Lord. This abode is referred to as Goloka. In the Brahma-saṁhitā it is beautifully described: Goloka eva nivasaty akhilātma-bhūtaḥ. The Lord resides eternally in His abode Goloka, yet He can be approached from this world, and to this end the Lord comes to manifest His real form, sac-cid-ānanda-vigraha. When He manifests this form, there is no need for our imagining what He looks like. To discourage such imaginative speculation, He descends and exhibits Himself as He is, as Śyāmasundara. Unfortunately, the less intelligent deride Him because He comes as one of us and plays with us as a human being. But because of this we should not consider that the Lord is one of us. It is by His potency that He presents Himself in His real form before us and displays His pastimes, which are prototypes of those pastimes found in His abode.
In the effulgent rays of the spiritual sky there are innumerable planets floating. The brahmajyoti emanates from the supreme abode, Kṛṣṇaloka, and the ānandamaya-cinmaya planets, which are not material, float in those rays. The Lord says, na tad bhāsayate sūryo na śaśāṅko na pāvakaḥ yad gatvā na nivartante tad dhāma paramaṁ mama. One who can approach that spiritual sky is not required to descend again to the material sky. In the material sky, even if we approach the highest planet (Brahmaloka), what to speak of the moon, we will find the same conditions of life, namely birth, death, disease and old age. No planet in the material universe is free from these four principles of material existence.
Therefore the Lord says in Bhagavad-gītā, ābrahma-bhuvanāl lokāḥ punar āvartino ‘rjuna. The living entities are traveling from one planet to another, not by mechanical arrangement but by a spiritual process. This is also mentioned: yānti deva-vratā devān pitṝn yānti pitṛ-vratāḥ. No mechanical arrangement is necessary if we want interplanetary travel. The Gītā instructs: yānti deva-vratā devān. The moon, the sun and higher planets are called svargaloka. There are three different statuses of planets: higher, middle and lower planetary systems. The earth belongs to the middle planetary system. Bhagavad-gītā informs us how to travel to the higher planetary systems (devaloka) with a very simple formula: yānti deva-vratā devān. One need only worship the particular demigod of that particular planet and in that way go to the moon, the sun or any of the higher planetary systems.
Yet Bhagavad-gītā does not advise us to go to any of the planets in this material world because even if we go to Brahmaloka, the highest planet, through some sort of mechanical contrivance by maybe traveling for forty thousand years (and who would live that long?), we will still find the material inconveniences of birth, death, disease and old age. But one who wants to approach the supreme planet, Kṛṣṇaloka, or any of the other planets within the spiritual sky, will not meet with these material inconveniences. Amongst all of the planets in the spiritual sky there is one supreme planet called Goloka Vṛndāvana, which is the original planet in the abode of the original Personality of Godhead Śrī Kṛṣṇa. All of this information is given in Bhagavad-gītā, and we are given through its instruction information how to leave the material world and begin a truly blissful life in the spiritual sky.
Excerpted from the Introduction to the Bhagavad-gita As It Is 1972 Edition
By His Divine Grace A. C. Bhaktivedanta Swami Prabhupada