“We need to know the truth, Vimes. Commander Sam Vimes’s truth. It may count for more than you think. In the Plains, certainly, and much further. People know about you, Commander. Descendant of a watchman who believed that if a corrupted court will not behead an evil king, then the watchman should do it himself–”
“It was only one king,” Vimes protested. “It wasn’t a habit!”
“Sam Vimes once arrested me for treason,” said Vetinari calmly. “And Sam Vimes once arrested a dragon. Sam Vimes stopped a war between nations by arresting two high commands. He’s an arresting fellow, Sam Vimes. Sam Vimes killed a werewolf with his bare hands, and carries law with him, like a lamp–”
“Where did all that come from?”
“Watchmen across half the continent will say that Sam Vimes is as straight as an arrow, can’t be corrupted, won’t be turned, never took a bribe.”

– on Sam Vimes |
Terry Pratchett, Thud!