A man without a bias cannot write interesting history - if indeed such a man exists.

[There are m]oral precepts that we consider really important, such as 'don't pick your nose' or 'don't eat peas with a knife'. There may, for ought I know, be admirable reasons for eating peas with a knife, but . . . early persuasion has made me completely incapable of appreciating them.

To expect a personality to survive the disintegration of the brain is like expecting a cricket club to survive when all of its members are dead.

Many orthodox people speak as though it were the business of sceptics to disprove received dogmas rather than of dogmatists to prove them. This is, of course, a mistake.

Why repeat the old errors, if there are so many new errors to commit?

Religion is something left over from the infancy of our intelligence, it will fade away as we adopt reason and science as our guidelines.

Physics, owing to the simplicity of its subject matter, has reached a higher state of development than any other science.