Great men too make mistakes, and many among them do it so often that one is almost tempted to call them little men.

Everyone is a genius at least once a year. The real geniuses simply have their bright ideas closer together.

Doubt must be no more than vigilance, otherwise it can become dangerous.

One has to do something new in order to see something new.

What is the good of drawing conclusions from experience? I don't deny we sometimes draw the right conclusions, but don't we just as often draw the wrong ones?

The celebrated painter Gainsborough got as much pleasure from seeing violins as from hearing them.

Non cogitant, ergo non sunt.