Lord Krishna, God, the Supreme Person, manifests the spiritual world to his devotees.
Devotes who have reached maturity, having attained the perfection of Krishna consciousness, are transferred to any galaxy upon leaving their physical bodies, where Krishna then appears. There, they receive their first opportunity to live in the direct personal company of the Lord. This “formation” can be seen at Earth's Vrindavana in India, where Krishna performed his sublime entertainments 5,000 years ago on our planet. Thus, Krishna revealed to the inhabitants of Vrindavana the true nature of the spiritual planets, so that they might know their destiny.
Krishna manifested to them the spiritual world, eternal, endless, and all-knowing. Various forms of bodies exist in the material universe, some high, some low, and knowledge differs according to these forms. For example, the body of a child is not as perfect as that of an adult. In all forms of life, the levels are different; this is true of aquatic beings, plants and trees, reptiles, insects and birds, the various mammals, and civilized and uncivilized human beings.
Beyond the human form are the celestial beings, the perfect beings, the inhabitants of the Edenic, paradisiacal planets, the Caranas, the Siddhas, and even the inhabitants of Brahmaloka, the most important planet in our galaxy, the abode of Brahma, the demiurge and first being created. Even among the celestial beings, different degrees of knowledge are manifested.
But beyond the material universe, in the “spiritual atmosphere,” all beings equally enjoy full knowledge. There, on the spiritual planets or on Krishnaloka, the most important planet in the spiritual world, where Krishna resides, all, without distinction, are absorbed in the service of love and devotion offered to the Lord.
In truth, to attain knowledge in its fullness is to know Krishna as God, the Supreme Person. The Lord teaches us that in the radiance that constitutes the “spiritual atmosphere” of the spiritual world, there is no need for the light of the sun, the moon, or electrical force to see, for there, all the planets produce their own light and are eternal.
The spiritual world, bathed in this radiance that emanates from Krishna's sublime spiritual body and extends infinitely, even encompassing the Lord Himself, is neither created nor destroyed, for it is eternal. Beyond the material universe lies an eternal, spiritual universe, where everything exists for eternity.
Souls conditioned by matter can only have knowledge of the spiritual world through great sages established beyond the influence of the three attributes and modes of influence of material nature: virtue, passion, and ignorance. Unless one is firmly established at the absolute level, knowing the nature of this spiritual world is virtually impossible.