The early works of Samkhya, the rationalist school of Hinduism, do not identify or directly mention the Maya doctrine. The discussion of Maya theory, calling it into question, appears after the theory gains ground in Vedanta school of Hinduism. Vācaspati Miśra's commentary on the "Samkhyakarika", for example, questions the Maya doctrine saying "It is not possible to say that the notion of the phenomenal world being real is false, for there is no evidence to contradict it". Samkhya school steadfastly retained its duality concept of Prakrti and Purusha, both real and distinct, with some texts equating Prakrti to be Maya that is "not illusion, but real", with three Guṇas in different proportions whose changing state of equilibrium defines the perceived reality.