BG Chap 13 - The jīva's connection with prakṛti - prakṛti being the cause
Nature (prakṛti) is said to be the cause of the connection between jīva and prakṛti because it produces the body, senses and sense devatās. Nature is the cause of all material causes and effects. Kārya-kāraṇa-kartṛtve hetu prakṛtir ucyate. Kārya means body. Since the senses are necessary in order to achieve action and knowledge, they are called kāraṇa (cause). Prakṛti is a cause (kartṛtve) in that it transforms itself into the forms of the senses and body. The jīva is situated in prakṛti and exploits prakṛti. But that prakṛti though ruled by jīva is the creator of bodies and senses, by transforming itself into these according to the jīva’s karmas. Prakṛti is the cause of the jīva’s unfortunate condition by his misidentification with the body (kārya), the senses which produce happiness and distress (kāraṇa) and the presiding deities of the senses (kartṛ). Prakṛti by association with the jīva transforms into the form of body, senses and sense devatās, and by its function of ignorance, it becomes the bestower of the jīva’s misidentification.