Just as light is diffused from a fire which is confined to one spot, so is this whole universe the diffused energy of the supreme Brahman. And as light shows a difference, greater or less, according to its nearness or distance from the fire, so is there a variation in the energy of the impersonal Brahman. Brahma, Vishnu, and Shiva are his chief energies. The deities are inferior to them; the yakshas, etc. to the deities; men, cattle, wild animals, birds, and reptiles to the yakshas, etc.; and trees and plants are the lowest of all these energies.... Vishnu is the highest and most immediate of all the energies of Brahman, the embodied Brahman, formed of the whole Brahman. On him this entire universe is woven and interwoven: from him is the world, and the world is in him; and he is the whole universe. Vishnu, the Lord, consisting of what is perishable as well as what is imperishable, sustains everything, both Spirit and Matter, in the form of his ornaments and weapons.

(The Vishnu Purana)