You must believe that you can help bring about a better world. A good society is produced only by good individuals, just as truly as a majority in a presidential election is produced by the votes of single electors.

Next to worry probably one of the most potent causes of unhappiness is envy.

Freedom in general may be defined as the absence of obstacles to the realization of desires.

The more intense has been the religion of any period and the more profound has been the dogmatic belief, the greater has been the cruelty and the worse has been the state of affairs.

The taboo against nakedness is an obstacle to a decent attitude on the subject of sex.

When we have told how things behave when they are electrified, and under what circumstances they are electrified, we have told all there is to know

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