Even as rigorous a determinist as Karl Marx, who at times described the social behaviour of the bourgeoisie in terms which suggested a problem in social physics, could subject it at other times to a withering scorn which only the presupposition of moral responsibility could justify.

The whole art of politics consists in directing rationally the irrationalities of men.

The measure of our rationality determines the degree of vividness with which we appreciate the needs of other life, the extent to which we become conscious of the real character of our own motives and impulses, the ability to harmonize conflicting impulses in our own life and in society, and the capacity to choose adequate means for approved ends.

No nation can say, 'We will capitulate to tyranny rather than accept a speculative fate - to accept an absolute fate in alternative to a speculative one' - no nation can do that.

Nothing worth doing can be accomplished in a single lifetime.

The more complex the world situation becomes, the more scientific and rational analysis you have to have, the less you can do with simple good will and sentiment.

Man's capacity for justice makes democracy possible, but man's inclination to injustice makes democracy necessary.