You propound a complicated arithmetical problem: say cubing a number containing four digits. Give me a slate and half an hour's time, and I can produce a wrong answer.

Imagination is the beginning of creation.

Besides, do any of us understand what we are doing? If we did, would we ever do it?

Youth is just wasted on young people.

[Chess] is a foolish expedient for making idle people believe they are doing something very clever, when they are only wasting their time.

The fact is that the intrinsic worth of the book, play or whatever the author is trying to sell is the least, last factor in the the whole transaction.

What is life but a series of inspired follies.