When a man's partner's killed, he's supposed to do something about it. It doesn't make any difference what you thought of him, he was your partner and you're supposed to do something about it. As it happens, we're in the detective business; well, when one of your organization gets killed, it's, it's bad business to let the killer get away with it. Bad all around. Bad for every detective everywhere.
John Huston (1906–1987), U.S. filmmaker. Sam Spade (Humphrey Bogart), The Maltese Falcon, to Brigid O'Shaughnessy (Mary Astor) after he has reported her to the police for the murder of Miles Archer, his partner (1941).