Yoga Sutras of Patanjali · 4.17

तदुपरागापेक्षित्वाच्चित्तस्य वस्तु ज्ञाताज्ञातम्॥१७॥

taduparāgāpekṣitvāc cittasya vastu jñātājñātam

An object is known or unknown by the mind depending on whether the mind is colored by it.

— Yoga Sutras of Patanjali 4.17

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).