In the Sāṅkhya and Yoga philosophical literatures, it is contrasted with Purusha (spirit, consciousness), and Prakriti refers to "the material world, nature, matter, physical and psychological character, constitution, temper, disposition". According to Knut Jacobsen, in the dualistic system of the Samkhya school, "Purusha is the principle of pure consciousness, while Prakriti is the principle of matter", where Purusha is the conscious witness in every living being, while Prakriti is the manifest world.
