He is unworthy of the name of man who is ignorant of the fact that the diagonal of a square is incommensurable with its side.
PlatoFollow your dream as long as you live, do not lessen the time of following desire, for wasting time is an abomination of the spirit.
PlatoThat makes me think, my friend, as I have often done before, how natural it is that those who have spent a long time in the study of philosophy appear ridiculous when they enter the courts of law as speakers. Those who have knocked about in courts and the like from their youth up seem to me, when compared with those who have been brought up in philosophy and similar pursuits, to be as slaves in breeding compared with freemen.
Plato