Doubt is not a pleasant condition, but certainty is absurd.

The infinitely little have a pride infinitely great.

The only way to comprehend what mathematicians mean by Infinity is to contemplate the extent of human stupidity.

Let us help one another to bear our burdens.

The rude beginnings of every art acquire a greater celebrity than the art in perfection; he who first played the fiddle was looked upon as a demigod.

Every man can educate himself. It's shameful to put one's mind into the hands of those whom you wouldn't entrust with your money. Dare to think for yourself.

Before receiving your instruction, I must tell you what happened to me one day. I had just had a closet built at the end of my garden. I heard a mole arguing with a cockchafer; 'Here's a fine structure,' said the mole, 'it must have been a very powerful mole who did this work.' 'You're joking,' said the cockchafer; 'it's a cockchafer full of genius who is the architect of this building.' From that moment I resolved never to argue.