Yoga Sutras of Patanjali · 4.20
एकसमये चोभयानवधारणम्॥२०॥
ekasamaye cobhayānavadhāraṇam
Furthermore, the mind cannot perceive itself and an object simultaneously.
— Yoga Sutras of Patanjali 4.20
Source: Sanskrit attributed to Patanjali (c. 2nd century BCE – 4th century CE). Public-domain English readings drawn from Swami Vivekananda's 'Raja Yoga' (1896) and Charles Johnston's 'The Yoga Sutras of Patanjali' (1912).