Much of the most important evils that mankind have to consider are those which they inflict upon each other through stupidity or malevolence or both.

Beware the man of the single book

I am allowed to use plain English because everybody knows that I could use mathematical logic if I chose.

A drop of water is not immortal; it can be resolved into oxygen and hydrogen. If, therefore, a drop of water were to maintain that it had a quality of aqueousness which would survive its dissolution we should be inclined to be skeptical. In like manner we know that the brain is not immortal.

The world is full of magical things patiently waiting for our wits to grow sharper.

The fundamental concept in social science is Power, in the same sense in which Energy is the fundamental concept in physics.

With civilized men..., it is, I think, chiefly love of excitement which makes the populace applaud when war breaks out; the emotion is exactly the same as at a football match, although the results are sometimes somewhat more serious.