The Once and Future King Book 3, Chapter 28
Many knights die in the search for the grail, and many return empty-handed. Gawaine tells the story of Galahad, who has apparently been self-righteously rescuing people all over the country. He has even beaten his father, Lancelot, in a fight! Still, no one likes him because he is a know-it-all and too holy. Gawaine thinks the whole quest is useless. He has been told by a hermit that he has been having no success on the quest because he has been using it as an excuse to fight with other knights, rather than become pure by finding the Grail. Gawaine disregards the idea, but Arthur is very interested in it.