13.20 Know this Prakrti and Purusa (self) are uncreated and are beginningless. Know that the modifications, desire, hatred etc., which cause bondage, and the alities of modesty etc., which cause release, originate from Prakrti. The Prakrti, having no beginning, develops into the form of the body, and conjoint with the self, causes bondage through its own transformations such as desire and hatred. The same Prakrti, through its transformations like modesty etc., causes release. Such is the meaning.

The difference in the functions of Prakrti and Purusa in combination is stated -