Yoga Sūtra Chapter Two verse 17

द्रष्टृदृश्ययोः संयोगो हेयहेतुः ॥१७॥

draṣṭṛ-dṛśyayoḥ saṃyogaḥ heya-hetuḥ ||17||

The cause of what must be overcome is the conjunction of the seer and the seen.

draṣṭṛ - seerdṛśya - the seensaṃyoga - conjunctionheya - overcomehetu - cause