Sanātana Gosvāmī thus inquired into all phases of devotional service, or Kṛṣṇa consciousness, and Lord Caitanya taught him most confidentially from authoritative scriptures like Śrīmad-Bhāgavatam. The Lord also referred to the Vedic literature known as Hari-vaṁśa, which gives information about the transcendental abode of Kṛṣṇa. This information was disclosed by Indra when he offered his prayers after being defeated upon challenging the potency of Kṛṣṇa. In the Hari-vaṁśa it is stated that although birds and airplanes can fly high in the sky above the earth, they cannot reach the higher planetary systems. The higher planetary systems extend upward from the sun planet, which is situated in the middle of the universe. Above the sun are planetary systems where persons who are elevated by great austerities and penances are situated. The whole material universe is called Devī-dhāma, and above it is Śiva-dhāma, where Lord Śiva and his wife Pārvatī eternally reside. Above that planetary system is the spiritual sky, where innumerable spiritual planets, known as Vaikuṇṭhas, are situated. And above these Vaikuṇṭha planets is Kṛṣṇa's planet, known as Goloka Vṛndāvana. The word goloka means "planet of the cows." Because Kṛṣṇa is very fond of cows, His abode is known as Goloka. Goloka Vṛndāvana is larger than all the material and spiritual planets put together.
In his prayers in the Hari-vaṁśa, Indra admitted that he could not understand the situation of Goloka, even by asking Brahmā. Devotees of the Nārāyaṇa expansion of Kṛṣṇa attain the Vaikuṇṭha planets, but it is very difficult to reach the Goloka planet. Indeed, that planet can be reached only by devotees of Lord Caitanya or Lord Śrī Kṛṣṇa. Indra then said to Lord Kṛṣṇa: "You have descended from that Goloka planet in the spiritual world, and the disturbance I created was all due to my foolishness." Therefore Indra begged Lord Kṛṣṇa to excuse him.