It is a true observation of ancient writers, that as men are apt to be cast down by adversity, so they, are easily satiated with prosperity, and that joy and grief produce the same effects. For whenever men are not obliged by necessity to fight they fight from ambition, which is so powerful a passion in the human breast that however high we reach we are never satisfied.
Niccolo MachiavelliTherefore it is unnecessary for a prince to have all the good qualities I have enumerated, but it is very necessary to appear to have them.
Niccolo Machiavelli