I've heard men complain of doing woman's work, and women complain of doing man's work, but I've never heard the work complain of who did it, so long … - Lloyd Alexander

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.

I cannot forgive myself for what I did. It has long been one of my strictest principles not to interfere with the life of any individual, let alone attempt to shorten it. If an exception were to be made, Dr. Helvitius would surely qualify. It might be argued that, having neither scruples nor conscience, he had no claim upon the conscience of someone else — least of all, his intended victims. But that is a question to be resolved by a judgment higher than mine. In the event, my responsibility toward Vesper outweighed every other consideration.
I can state in all honesty: I meant only to wound him.
I cannot forgive myself — for missing the villain completely.

If I fret over tomorrow, I'll have little joy today.