Verse
प्रकृतिं पुरुषं चैव विद्यनादि उभौ वपि ।विकारांश्च गुणांश्चैव विद्धि प्रकृतिसम्भवान् ॥
Know thou that Purusha (the Soul) and Prakriti (Nature) are both without origin and eternal; but the modes of Nature and the lower forms she assumes to our conscious experience have an origin in Prakriti (in the transactions of these two entities).
Gītā 13·20