We avenge intellect when we dupe a fool, and it is a victory not to be despised for a fool is covered with steel and it is often very hard to find his vulnerable part.
Giacomo CasanovaI often had no scruples about deceiving nitwits and scoundrels and fools when I found it necessary. ...We avenge intelligence when we deceive a fool, and... deceiving a fool is an exploit worthy of an intelligent man. What has infused my very blood with an unconquerable hatred of the whole tribe of fools from the day of my birth is that I become a fool myself when I am in their company.
Giacomo Casanova