Honest unaffected distrust of human abilities under all circumstances is the surest sign of strength of mind.

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.

I am grateful that I am not as judgmental as all those censorious, self-righteous people around me. In each of us there is a little of all of us.

Food probably has a very great influence on the condition of men. Wine exercises a more visible influence, food does it more slowly but perhaps just as surely. Who knows if a well-prepared soup was not responsible for the pneumatic pump or a poor one for a war?

If you are going to build something in the air it is always better to build castles than houses of cards.

What you have been obliged to discover by yourself leaves a path in your mind which you can use again when the need arises.

Everyone is a genius at least once a year.