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 essence of man is his freedom. Sin is committed in that freedom. Sin can therefore not be attributed to a defect in his essence. It can only be understood as a self-contradiction, made possible by the fact of his freedom but not following necessarily from it.

As racial, economic and national groups, they take for themselves, whatever their power can command.

Democracy is finding proximate solutions to insoluble problems.

Reason is not the sole basis of moral virtue in man. His social impulses are more deeply rooted than his rational life.

Every experience proves that the real problem of our existence lies in the fact that we ought to love one another, but do not.

What is funny about us is precisely that we take ourselves too seriously.