Yoga Sūtra Chapter Four verse 19

न तत्स्वाभासं दृश्यत्वात् ॥१९॥

na tat-svā-bhāsaṃ dṛśyatvāt ||19||

That, not own luminosity,
due to the quality of the seen.

na - no; not; nor, neithertat - that, thissva - own; one's selfbhāsa - luminosity, light, lustre, brightnessdṛśyatva - due to the quality of the seen