…you must know that there are two kinds of combat: one with laws, the other with force. The first is proper to man, the second to beasts; but because the first is often not enough, one must have recourse to the second. Therefore it is necessary for a prince to know well how to use the beast and the man. This role was taught covertly to princes by ancient writers, who wrote that Achilles, and many other ancient princes, were given to Chiron the centaur to be raised, so that he would look after them with his discipline. To have as teacher a half-beast, half-man means nothing other than that a prince needs to know how to use both natures; and the one without the other is not lasting.
Thus, since a prince is compelled of necessity to know well how to use the beast, he should pick the fox and the lion, because the lion does not defend itself from snares and the fox does not defend itself from wolves. So one needs to be a fox to recognize snares and a lion to frighten the wolves.
—Niccolò Machiavelli (translated by Harvey C. Mansfield)
—found in The Prince (1513-1515; this translation 1985)