Much can be inferred about a man from his mistress: in her one beholds his weaknesses and his dreams.

Everyone is perfectly willing to learn from unpleasant experience - if only the damage of the first lesson could be repaired.

Man is a masterpiece of creation . . .

One of the greatest creations of the human mind is the art of reviewing books without having read them.

Perhaps in time the so-called Dark Ages will be thought of as including our own.

Do not say hypothesis, and even less theory: say way of thinking.

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.