Civilized life, if it is to be stable, must provide a harmless outlets for the impulses which our remote ancestors satisfied in hunting. In Australia, where people are few, and rabbits are many, I watched the whole populace satisfying the primitive impulse in the primitive manner by the skilful slaughter of many thousands of rabbits.

Force plays a much larger part in the government of the world than it did before 1914, and what is especially alarming, force tends increasingly to fall into the hands of those who are enemies of civilization.

True happiness for human beings is possible only to those who develop their godlike potentialities to the utmost.

No people anywhere in the world would accept being expelled en masse from their own country; how can anyone require the people of Palestine to accept a punishment which nobody else would tolerate?

People are zealous for a cause when they are not quite positive that it is true.

If a Black Death could be spread throughout the world once in every generation survivors could procreate freely without making the world too full.

Only mathematics and mathematical logic can say as little as the physicist means to say.