It is the evil in man that makes democracy necessary, and man's belief in justice that makes democracy possible.

Original sin is that thing about man which makes him capable of conceiving of his own perfection and incapable of achieving it.

Nationalism: One of the effective ways in which the modern man escapes life's ethical problems.

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

[There is] an increasing tendency among modern men to imagine themselves ethical because they have delegated their vices to larger and larger groups.

Man is both strong and weak, both free and bound, both blind and far-seeing. He stands at the juncture of nature and spirit; and is involved in both freedom and necessity.

All men who live with any degree of serenity live by some assurance of grace.

Man is his own most vexing problem.

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.