Although I tried to be universal in thought, I am European by instinct and inclination.

Check out not to become a man or woman of achievement, but instead seek to become a particular person of price.

The only mistake in life is the lesson not learned.

How insidious Nature is when one is trying to get at it experimentally.

Never lose a holy curiosity. Try not to become a man of success but rather try to become a man of value. He is considered successful in our day who gets more out of life than he puts in. But a man of value will give more than he receives.

With fame I become more and more stupid, which of course is a very common phenomenon.

If I give you a pfennig, you will be one pfennig richer and I'll be one pfennig poorer. But if I give you an idea, you will have a new idea, but I shall still have it too.