Yoga Sutra 2.06 purusa is the power of seer buddhi is the power of seeing
Sūtra II.6 The single selfhood, as it were, of the powers of seer and seeing is I-am-ness Puruṣa is the power of seer; mind (buddhi) is the power of seeing. The taking on of a single nature as it were, by these two, is called the taint of I-am-ness. Now the illusion called I-am-ness. Puruṣa…