One does not ask whether a scientific theory is true, but only whether it is convenient.

If we knew exactly the laws of nature and the situation of the universe at the initial moment, we could predict exactly the situation of the same universe at a succeeding moment.

Geometry is the art of correct reasoning from incorrectly drawn figures.

Most striking at first is the appearance of sudden illumination, a manifest sign of long unconscious prior work.

Point set topology is a disease from which the human race will soon recover.

[T]he different branches of Arithmetic - Ambition [G]eometry is not true, it is advantageous.

A sane mind should not be guilty of a logical fallacy, yet there are very fine minds incapable of following mathematical demonstrations.