The purpose of psychology is to give us a completely different idea of the things we know best.

Every beginning is a consequence - every beginning ends some thing.

History is the most dangerous product evolved from the chemistry of the intellect. ...History will justify anything. It teaches precisely nothing, for it contains everything and furnishes examples of everything.

The world acquires value only through its extremes and endures only through moderation; extremists make the world great, the moderates give it stability.

The great virtues of the German people have created more evils than idleness ever did vices

Liberty is the hardest test that one can inflict on a people. To know how to be free is not given equally to all men and all nations.

to live means to lack something at every moment