"“People do not understand the limits of tyranny,” said Vetinari, as if talking to himself. “They think that because I can do what I like I can do what I like. A moment’s thought reveals, of course, that this cannot be so.” “Oh, it is the same with magic,” said the Archchancellor. “If you flash spells around like there’s no tomorrow, there’s a good chance that there won’t be.” (p. 49)"