Bhagavad Gita 13.18

ज्योतिषामपि तज्ज्योतिस्तमसः परमुच्यते।ज्ञानं ज्ञेयं ज्ञानगम्यं हृदि सर्वस्य विष्ठितम् ॥१३.१८॥

jyotiṣāmapi tajjyotistamasaḥ paramucyatejñānaṃ jñeyaṃ jñānagamyaṃ hṛdi sarvasya viṣṭhitam

That Light of all lights is said to be beyond darkness: knowledge, the knowable, and the goal of knowledge, seated in the hearts of all.

गीता