Our great democracies still tend to think that a stupid man is more likely to be honest than a clever man.

Change is scientific, ‘progress' is ethical. Change is indubitable whereas progress is a matter of controversy.

When two things have frequently existed in close temporal contiguity, either comes in time to cause the other.

The bulk of the population of every country is persuaded that all marriage customs other than its own are immoral, and that those who combat this view only do so in order to justify their own loose lives.

Mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true.

For all serious intellectual progress depends upon a certain kind of independence of outside opinion, which cannot exist where the will of the majority is treated with that kind of religious respect which the orthodox give to the will of God.

The point of philosophy is to start with something so simple as not to seem worth stating, and to end with something so paradoxical that no one will believe it.