A donkey appears to me like a horse translated into Dutch.

I have never yet met anyone who did not think it was an agreeable sensation to cut tinfoil with scissors.

What is called an acute knowledge of human nature is mostly nothing but the observer's own weaknesses reflected back from others.

Perseverance can lend the appearance of dignity and grandeur to many actions, just as silence in company affords wisdom and apparent intelligence to a stupid person.

All mathematical laws which we find in Nature are always suspect to me, in spite of their beauty. They give me no pleasure. They are merely auxiliaries. At close range it is all not true.

The feeling of health can only be gained by sickness.

The construction of the universe is certainly very much easier to explain than is that of the plant.