A great philosophy is not a philosophy without reproach; it is philosophy without fear.

We shall never know how many acts of cowardice have been motivated by the fear of appearing not sufficiently progressive.

Homer is new this morning, and perhaps nothing is as old as today's newspaper.

Love is rarer than genius itself. And friendship is rarer than love.

Any father whose son raises his hand against him is guilty of having produced a son who raised his hand against him.

A great philosophy is not one that passes final judgments and establishes ultimate truth. It is one that causes uneasiness and starts commotion.

Freedom is a system based on courage.