Bhagavad Gita · 13.18

ज्योतिषामपि तज्ज्योतिस्तमसः परमुच्यते।ज्ञानं ज्ञेयं ज्ञानगम्यं हृदि सर्वस्य विष्ठितम्॥

jyotiṣhām api taj jyotis tamasaḥ param uchyate jñānaṁ jñeyaṁ jñāna-gamyaṁ hṛdi sarvasya viṣhṭhitam

It is the light of all lights, said to be beyond darkness. It is knowledge itself, the object of knowledge, and the goal of knowledge, seated in the hearts of all.

— Bhagavad Gita 13.18

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)