The Katha Upanishad's frame is domestic and slightly comic: a father performing a sacrifice gives away worthless old cows, his son needles him about it, and the father snaps that he is giving the boy to Death. The boy takes it literally and goes. What follows is the tradition's clearest teaching text on the self — Yama, having kept a guest waiting three days, must grant three boons, and Nachiketa spends the first on his father's peace of mind, the second on a fire ritual, and the third on the question of whether anything survives. Yama tries hard to substitute a different prize. The imagery from the dialogue has been in use ever since: the self as the rider in the chariot of the body, the senses as horses, and the razor's edge that is the path. Vivekananda made one of its lines the motto of the whole modern Hindu revival.