In the agency of cause and effect, nature (prakṛti) is said to be the cause. In the experience of happiness and sorrow, the Person (puruṣa) is said to be the cause.
Man's spirit is set in nature, experiencing the qualities born of nature; its attachment to the qualities causes births in the wombs of good and evil.
(20) Material Nature, they say, is [itself] the cause of cause, effect, and agency, while 'person' is said to be the cause in the experience of pleasure and of pain.
13.21 With regard to the source of body and organs, Nature is said to be the cause. The soul is the cause so far as enjoyership of happiness and sorrow is concerned.
13.21 The Prakṛti is said to be the cause of agency to the body (Kārya) and sense-organs (Karana). The self is said to be the cause of experiencing pleasure and pain.
13.21 In the production of the effect and the cause, Nature (matter) is said to be the cause; in the experience of pleasure and pain, the soul is said to be the cause.