Translated by Swami Lokeswarananda, 186 Pages, Paperback.
Katha Upanisad is found in the Taittiriya section of the Krsna Yajur Veda. It teaches Self-Knowledge through a story that centers round a dialogue between Yama, the presiding deity of death, and Naciketa, and intellegent Brahmin boy.
The secret of immorality is to be found in purification of the heart, in meditation, in realization of the identity of the Self within and Brahman without. For immorality is simply union with God.