Due to ignorance and erroneous conception the reality gets mingled with Prakrti. The ever-rising self-luminous Purusa is the greatest and omnipresent. Due to the thoughtless¬ ness, non-discrimination of the ego, one considers himself, “I am the doer”. But the sages realize the unmanifest soul as eternal and Prakrti of the nature of sat and asat (existence and non-existence). He takes Pradhana to be Purusa and begins to argue that it is the Brahman that is the cause. Thereby the Atman, though steady and unsullied becomes (associated with it) by contact.