The life of man is a long march through the night, surrounded by invisible foes, tortured by weariness and pain, towards a goal that few can hope to reach, and where none may tarry long.

It can be shown that a mathematical web of some kind can be woven about any universe containing several objects. The fact that our universe lends itself to mathematical treatment is not a fact of any great philosophical significance.

This is one of those views which are so absolutely absurd that only very learned men could possibly adopt them.

Not to be absolutely certain is, I think, one of the essential things in rationality.

Nothing is so exhausting as indecision, and nothing is so futile.

The discipline in your life should be one determined by your own desires and your own needs, not put upon you by society or authority.

Science may set limits to knowledge, but should not set limits to imagination.