In the Padma Purāṇa (Uttara-khaṇḍa 255.57) it is stated that the material energy and the spiritual energy are separated by the Virajā River. That river flows from the perspiration of the first puruṣa incarnation. On the far bank of the Virajā is the eternal nature, unlimited and all-blissful, called the spiritual sky, the spiritual kingdom, or the kingdom of God.
The spiritual planets are called Vaikuṇṭhas because there is no lamentation or fear there and everything is eternal. The spiritual world has been calculated to comprise three fourths of the energies of the Supreme Lord, and the material world comprises one fourth. But no one can understand what that three fourths is, since even this material universe cannot be described. Trying to convey to Sanātana Gosvāmī something of the extent of this display of one fourth of Kṛṣṇa's energy, Caitanya Mahāprabhu next cited an incident from the scriptures in which Brahmā, the lord of this universe, came to see Kṛṣṇa at Dvārakā.