In the Ka_th_a-Upanishad, for instance, a father is introduced offering what is called an _All_-sacrifice, where everything is supposed to be given up. His son, who is standing by, taunts his father with not having altogether fulfilled his vow, because he has not sacrificed his son. Upon this, the father, though angry and against his will, is obliged to sacrifice his son. Again, when the son arrives in the lower world, he is allowed by the Judge of the Dead to ask for three favors. He then asks to be restored to life, to be taught some sacrificial mysteries, and, as the third boon, he asks to know what becomes of man after he is dead. Yama, the lord of the Departed, tries in vain to be let off from answering this last question. But he, too, is bound by his promise, and then follows a discourse on life after death, or immortal life, which forms one of the most beautiful chapters in the ancient literature of India. The whole plot of one of the great epic poems, the Râmâya_n_a, rests on a rash promise given by Da_s_aratha, king of Ayodhyâ, to his second wife, Kaikeyî, that he would grant her two boons. In order to secure the succession to her own son, she asks that Râma, the eldest son by the king's other wife, should be banished for fourteen years. Much as the king repents his promise, Râma, his eldest son, would on no account let his father break his word, and he leaves his kingdom to wander in the forest with his wife Sitâ and his brother Lakshma_n_a. After the father's death, the son of the second wife declines the throne, and comes to Râma to persuade him to accept the kingdom of his father. But all in vain. Râma will keep his exile for fourteen years, and never disown his father's promise. Here follows a curious dialogue between a Brâhman _G_âbâli and Prince Râma, of which I shall give some extracts:[74]