One cannot demand of a scholar that he show himself a scholar everywhere in society, but the whole tenor of his behavior must none the less betray the thinker, he must always be instructive, his way of judging a thing must even in the smallest matters be such that people can see what it will amount to when, quietly and self-collected, he puts this power to scholarly use.

Delight at having understood a very abstract and obscure system leads most people to believe in the truth of what it demonstrates.

The most perfect ape cannot draw an ape; only man can do that; but, likewise, only man regards the ability to do this as a sign of superiority.

The fly that doesn't want to be swatted is most secure when it lights on the fly-swatter.

Actions speak louder than words, but not nearly as often.

The true test of intelligence is not how much we know how to do, but how we behave when we don't know what to do

Success is more a function of consistent common sense than it is of genius.