Srimad Bhagvata Mahapurana: Book 5: Chapter 11: Verses 12-17
God, who is (ever) pure (unattached to the world) merely looks on (as a witness and never gets identified with) these (manifold) waves-appearing in an endless series, now manifest (in the waking and dream states) and (now) disappearing (in deep sleep)-of the mind, which is an adjunct ofthe 'Iva and a creation of Maya, and which (ever) indulges in impure activities (leading to transmigration). (The aforesaid) God is all-pervading, the most ancient (the first cause of the universe), all-perfect, (ever) patent, self-effulgent, free from birth (and death), the Ruler (even) of the highest beings (Brahma, Siva and others), the almighty Lord Vasudeva (the abode of the universe), (Himself) dwelling as the (inner) Controller of all the Jivas in every heart by His own Maya (wonderful divine power). Even as the air, entering in the form of breath (all) mobile (animate) and immobile (inanimate) beings, controls them, so the supreme Lord Vasudeva has interpenetrated this universe as the all-witnessing Inner Controller (of all). Man (lit., an embodied soul) continues to revolve in (the whirligig of) mundane existence so long as he is not able, O ruler of men, to realize the true nature of the Self-by shaking off this Maya (illusion in the form of identification with the body) by means of the light of wisdom, having got rid of (all) attachment and conquered the six (internal) enemies (in the shape of lust, anger, greed, infatuation, arrogance and jealousy), and so long as he is not able to recognize the said mind--a conditioning vesture of the soul, which brings with it an uninterrupted succession of grief, infatuation, disease, attachment, greed and animosity and occasions a feeling of mineness-as a fertile soil yielding the agonies of birth and death for man. Therefore, (ever) circumspect and armed with the worship of the (holy) feet of Lord Sri Hari in the form of your preceptor, get rid of this enemy (in the shape of the mind), that possesses enormous strength and has grown very insolent through (your) connivance, and, which though illusory in itself, yet robs you of your very self (true nature).
Thus ends the eleventh discourse, forming part of the Dialogue between the Brahman
(Bharata) and king Rahugana, in Book Five of the great and glorious Bhagavata-Purana, otherwise known as the Paramahamsa-Samhita.