Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 19

Sanskrit:

ब्रह्म ते हृदयं शुक्लं तप:स्वाध्यायसंयमै: ।यत्रोपलब्धं सद् व्यक्तमव्यक्तं च तत: परम् ॥ १९ ॥

ITRANS:

brahma te hṛdayaṁ śuklaṁtapaḥ-svādhyāya-saṁyamaiḥyatropalabdhaṁ sad vyaktamavyaktaṁ ca tataḥ param

Translation:

The Vedas are Your spotless heart, and through them one can perceive — by means of austerity, study and self-control — the manifest, the unmanifest and the pure existence transcendental to both.

Purport:

Vyakta, “the manifest,” consists of the visible things of this world, and avyakta consists of the subtle, underlying causes of cosmic creation. The Vedas point toward the transcendental realm of Brahman, which lies beyond all material cause and effect.