The world is like a game in which there are both honest and dishonest players, so that a prince who plays in this game must learn how to cheat, not in order to do it, but in order not to be the dupe of others.

Frederick II (1712–1786) King of Prussia (Frederick the Great, Friedrich der Große)

Anti-Machiavel, ch. 18 (1740) [tr. Sonnino (1981)]