If in life we are surrounded by death, so too in the health of our intellect by madness.

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.

Propositions show what they say: tautologies and contradictions show that they say nothing.

It is a dogma of the Roman Church that the existence of God can be proved by natural reason. Now this dogma would make it impossible for me to be a Roman Catholic. If I thought of God as another being like myself, outside myself, only infinitely more powerful, then I would regard it as my duty to defy him.

The limits of my language means the limits of my world.

Our greatest stupidities may be very wise.

All propositions are of equal value.