Lloyd Alexander: Thing

Source: The Chronicles of Prydain (1964–1968), Book II: The Black Cauldron (1965), Chapter 14

Source: The Chronicles of Prydain (1964–1968), Book II: The Black Cauldron (1965), Chapter 8

Source: The Chronicles of Prydain (1964–1968), Book V : The High King (1968), Chapter 21
Context: “How then?” Taran asked. “Could The Book of Three deceive you?”
“No, it could not.” Dallben said. “The book is thus called because it tells all three parts of our lives: the past, the present, and the future. But it could as well be called a book of ‘if.’ If you had failed at your tasks; if you had followed an evil path; if you had been slain; if you had not chosen as you did — a thousand ‘ifs,’ my boy, and many times a thousand. The Book of Three can say no more than ‘if’ until at the end, of all things that might have been, one alone becomes what really is. For the deeds of a man, not the words of a prophecy, are what shape his destiny.”

Source: Time Cat

Source: The Book of Three

Source: The Arkadians

Source: The Chronicles of Prydain (1964–1968), Book II: The Black Cauldron (1965), Chapter 3

Source: The Chronicles of Prydain (1964–1968), Book IV: Taran Wanderer (1967), Chapter 21

Source: Time Cat (1963), Chapter 9 “Secret Journeys” (p. 91)