For the educated, the authority of science rested on the strictness of its methods; for the mass, it rested on the powers of explanation.

The intellectuals' chief cause of anguish are one another's works.

The book, like the bicycle, is a perfect form.

The sole justification of teaching, of the school itself, is that the student comes out of it able to do something he could not do before. I say do and not know, because knowledge that doesn't lead to doing something new or doing something better is not knowledge at all.

By the time I was 9, I had the conviction that everybody in the world was an artist except plumbers or people who delivered groceries.

The world has long observed that small acts of immorality, if repeated, will destroy character. It is equally manifest, though never said, that uttering nonsense and half-truth without cease ends by destroying Intellect

Out of man's mind in free play comes the creation Science. It renews itself, like the generations, thanks to an activity which is the best game of homo ludens: science is in the strictest and best sense a glorious entertainment.