Even if a tamed wolf makes a good sheepdog, he will never understand how the sheep feel....You are most fortunate. For having been, as you thought, a coward, and helpless to fight - you know what that is like. You know what bitterness that feeling breeds - you know in your own heart what kind of evil it brings. And so you are most fit to fight it where it occurs.
Elizabeth Moon (1988). “Sheepfarmer's Daughter”, p.708, Baen Books