Punctuality is a quality the need of which is bound up with social co-operation. It has nothing to do with the relation of the soul to God, or with mystic insight, or with any of the matters with which the more elevated and spiritual moralists are concerned.

Boredom is... a vital problem for the moralist, since half the sins of mankind are caused by the fear of it.

Can a society in which thought and technique are scientific persist for a long period, as, for example, ancient Egypt persisted, or does it necessarily contain within itself forces which must bring either decay or explosion?

I feel life is so small unless it has windows into other worlds.

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

There are infinite possibilities of error, and more cranks take up fashionable untruths than unfashionable truths.

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