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

Non cogitant, ergo non sunt.

To see every day how people get the name 'genius' just as the wood-lice in the cellar the name 'millipede'-not because they have that many feet, but because most people don't want to count to 14-this has had the result that I don't believe anyone any more without checking.

Just as we outgrow a pair of trousers, we outgrow acquaintances, libraries, principles, etc., at times before they're worn out and times - and this is the worst of all - before we have new ones.

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

Probably no invention came more easily to man than heaven.

You can make a good living from soothsaying but not from truthsaying.