Muṇḍaka Upaniṣad · 3.2.17

ऋतं च स्वधया च सत्या च धर्मेण च यत् । तपसा चान्वविन्देद्ब्रह्म नाचिकेतं य आचिकेत

ṛtaṃ ca svadhayā ca satyā ca dharmeṇa ca yat | tapasā cānvavinded brahma nāciketaṃ ya āciketa

By cosmic order, by one’s own law, by truth, by dharma, by austerity — he who knows the Unknowable, that Brahman discovers.

The means for realization and the mystery of the known-unknown.

Ṛtam — cosmic order, universal law. Living in harmony with the totality.

Svadhayā — by one’s own law, innate nature. Fulfilling one’s own dharma.

Satyā — by truth. Rectitude, honesty, authenticity.

Dharmeṇa — by dharma. The ethical, social and cosmic order.

Tapasā — by austerity. Rigorous practice, the heat of transformation.

Anuvavindet — discovers, finds. Realization as discovery, not creation.

Na-ciketa — the unknowable, what cannot be known objectively. Brahman beyond dual knowledge.

Ya āciketa — who knows. He who penetrates this mystery.

Dharma lived, tapas practiced, unveil the ineffable.