Bertolt Brecht Quote
A man who sees another man on the street corner with only a stump for an arm will be so shocked the first time he'll give him sixpence. But the second time it'll only be a threepenny bit. And if he sees him a third time, he'll have him cold-bloodedly handed over to the police.
'The Ballad of Mack the Knife' in The Threepenny Opera (1928)