The Great Epic of the Bhārata dynasty 12.209.13

12.209.13

vyāpakaṃ sarvabhūteṣu vartate'pratighaṃ manaḥ |
manasyantarhitaṃ dvāraṃ dehamāsthāya mānasam || 13 ||

This is due to the nature of the Soul. The Soul should be comprehended. All the elements and the objects they compose exist in the Soul. In the state called dreamless slumber (sushupti), the manifest human body which, of course, is the door of dreams, disappears in the mind. Occupying the body the mind enters the soul which is manifest and upon which all existent and non-existent things depend, and becomes transformed into a wakeful witness with certainty of apprehension. Thus dwelling in pure Consciousness which is the soul of all things; it is regarded by the learned as transcending both Consciousness and all things in the universe. That yogin who in consequence of desire covets any of the divine attributes (of Knowledge or Renunciation, etc.) should regard a pure mind to be identical with the object of his desire. All things rest in a pure mind or soul. This is the result attained to by one who is engaged in penances. That yogin, however, who has crossed Darkness or ignorance, becomes possessed of transcending effulgence. When darkness or ignorance has been transcended, the embodied Soul becomes Supreme Brahma, the cause of the universe. The deities have penances and Vedic rites. Darkness (or pride and cruelty), which is destructive of the former, has been adopted by the Asuras. This, viz., Brahma, which has been said to have Knowledge only for its attribute, is difficult of attainment by either the deities or the Asuras.

As the imaginings of a person that is awake and engaged in acts, are due only to the creative power of the mind, after the same manner the impressions in a dream appertain only to the mind. A person with desire and attachment obtains those imaginings (in dreams) based upon the impressions of countless lives in the past. Nothing that impresses the mind once is ever lost, and the Soul being cognisant of all those impressions causes them to come forth from obscurity. Whichever among the three attributes of Goodness, Passion, and Darkness is brought about by the influence of past acts and by whichever amongst them the mind is affected for the time being in whatever way, the elements (in their subtile forms) display or indicate accordingly (in the way of images). After images have thus been produced, the particular attribute of Goodness or Passion or Darkness that may have been brought by past act rises in the mind and conduces to its last result, viz., happiness or misery. Those images having wind, bile, and phlegm for their chief causes, which men apprehend through ignorance and in consequence of propensities fraught with Passion and Darkness, cannot, it has been said, be easily discarded. Whatever objects again a person perceives in the mind (while wakeful) through the senses in a state of perspicuity are apprehended by the mind in dreams while the senses are obscured in respect of their functions. The Mind exists unobstructedly in all things.