The fact that an opinion has been widely held is no evidence whatever that it is not utterly absurd.
Envy ... is one form of a vice, partly moral, partly intellectual, which consists in seeing things never in themselves but only in their relations.
To be without some of the things you want is an indispensable part of happiness.
Even in civilized mankind faint traces of monogamous instinct can be perceived.
To discover a system for the avoidance of war is a vital need of our civilisation.
We know too much and feel too little.