A shade of sorrow passed over Taliesin’s face. ‘There are those,’ he said gently, ‘who must first learn loss, despair, and grief. Of all paths to wisdom, this is the cruelest and longest. Are you one who must follow such a way? This even I cannot know. If you are, take heart nonetheless. Those who reach the end do more than gain wisdom. As rough wool becomes cloth, and crude clay a vessel, so do they change and fashion wisdom for others, and what they give back is greater than what they won.
Lloyd Alexander, The High King (The Chronicles of Prydain #5)