Taittiriyaka-Upanishad: Second Valli, Ninth Anuvaka
“He who knows the bliss of that Brahman, from whence all speech, with the mind, turns away unable to reach it, he fears nothing.”
He does not distress himself with the thought, Why did I not do what is good? Why did I do what is bad? He who thus knows these two (good and bad), frees himself. He who knows both, frees himself. This is the Upanishad.