Yoga Sutras of Patanjali · 2.17

द्रष्टृदृश्ययोः संयोगो हेयहेतुः ॥१७॥

draṣṭṛ-dṛśyayoḥ saṁyogo heya-hetuḥ

The cause of what is to be avoided is the conjunction of the seer and the seen.

— Yoga Sutras of Patanjali 2.17

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).