Mbh 12.217.1a

"'Bhishma said, "He cannot be said to know Brahma who does not know the four topics (viz., dreams, dreamless slumber, Brahma as indicated by attributes, and Brahma as transcending all attributes), as also what is Manifest (viz., the body), and what is Unmanifest (the chit-soul), which the great Rishi (Narayana) has described as Tattwam.[776] That which is manifest should be known as liable to death. That which is unmanifest (viz., the chit-soul), should be known as transcending death. The Rishi Narayana has described the religion of Pravritti. Upon that rests the whole universe with its mobile and immobile creatures. The religion of Nivritti again leads to the unmanifest and eternal Brahma.[777] The Creator (Brahma) has described the religion of Pravritti. Pravritti implies rebirth or return. Nivritti, on the other hand, implies the highest end. The ascetic who desires to discriminate with exactitude between good and evil, who is always bent on understanding the nature of the Soul, and who devotes himself to the religion of Nivritti, attains to that high end.[778] One desirous of accomplishing this, should know both the Unmanifest and Purusha of which I shall speak presently. That, again, which is different from both the Unmanifest and Purusha, and which transcends them both, and which is distinguished from all beings, should be particularly viewed by one possessed of intelligence.[779] Both Prakriti and Purusha are without beginning and without end. Both are incapable of being known by their like. Both are eternal and indestructible. Both are greater than the greatest (of being). In these they are similar. They are points of dissimilarity again between them. (Of these I shall speak presently). Prakriti is fraught with the three attributes (of Goodness, Passion, and Darkness). It is also engaged in creation. The true attributes of Kshetrajna (Purusha or the Soul) should be known to be different.