ज्योतिषामपि तज्ज्योतिस्तमसः परमुच्यते। ज्ञानं ज्ञेयं ज्ञानगम्यं हृदि सर्वस्य विष्ठितम् ॥

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

That, the Light of all lights, is said to be beyond darkness; Wisdom, the Object of Wisdom, by Wisdom to be reached, seated in the hearts of all.

In plain words: The Eternal is the light behind every light and lies beyond all darkness. It is knowledge itself, the thing to be known, and what knowledge leads to. It lives in the heart of everyone.