Katha Upanishad

कठोपनिषद्

A poetic Upanishad of the Krishna Yajurveda in two parts and six chapters. The dialogue between young Nachiketa and Yama (god of death) reveals the secret of immortality, the indescribable Atman, and the two paths — Shreyas (the good) and Preyas (the pleasant). Source of the celebrated verse: Uttishtata Jagrata — Arise! Awake! (used by Swami Vivekananda).