Nobody has yet found a way of bombing that can prevent foot soldiers from walking.

We forge gradually our greatest instrument for understanding the world - introspection. We discover that humanity may resemble us very considerably - that the best way of knowing the inwardness of our neighbors is to know ourselves.

The whole speculation about morality is an effort to find a way of living which men who live it will instinctively feel is good.

A useful definition of liberty is obtained only by seeking the principle of liberty in the main business of human life, that is to say, in the process by which men educate their responses and learn to control their environment.

The principles of the good society call for a concern with an order of being - which cannot be proved existentially to the sense organs - where it matters supremely that the human person is inviolable, that reason shall regulate the will, that truth shall prevail over error.

The search for moral guidance which shall not depend upon external authority has invariably ended in the acknowledgment of some new authority.

Ages when custom is unsettled are necessarily ages of prophecy. The moralist cannot teach what is revealed; he must reveal what can be taught. He has to seek insight rather than to preach.