What can be shown, cannot be said.

It seems to me that, in every culture, I come across a chapter headed 'Wisdom.' And then I know exactly what is going to follow: 'Vanity of vanities, all is vanity.'

Death is not an event in life: we do not live to experience death.

Russell's books should be bound in two colours, those dealing with mathematical logic in red - and all students of philosophy should read them; those dealing with ethics and politics in blue - and no one should be allowed to read them.

The common behavior of mankind is the system of reference by means of which we interpret an unknown language.

Uttering a word is like striking a note on the keyboard of the imagination.

How hard I find it to see what is right in front of my eyes!