Ethics is in origin the art of recommending to others the sacrifices required for cooperation with oneself.

Much that passes as idealism is disguised hatred or disguised love of power.

If an opinion contrary to your own makes you angry, that is a sign that you are subconsciously aware of having no good reason for thinking as you do.

Formality Thus the absence of all mention of particular things or properties in logic or pure mathematics is a necessary result of the fact that this study is, as we say, "purely formal".

The megalomaniac differs from the narcissist by the fact that he wishes to be powerful rather than charming, and seeks to be feared rather than loved. To this type belong many lunatics and most of the great men of history.

What the world needs is not dogma but an attitude of scientific inquiry.

Even in the most purely logical realms, it is insight that first arrives at what is new.