It is the essence of genius to make use of the simplest ideas.

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.

It is the essence of genius to make use of the simplest ideas.

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

He who does not bellow the truth when he knows the truth makes himself the accomplice of liars and forgers.

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