Human existence is so fragile a thing and exposed to such dangers that I cannot love without trembling.

The great error of nearly all studies of war... has been to consider war as an episode in foreign policies, when it is an act of interior politics.

There are only two things that pierce the human heart. One is beauty. The other is affliction.

All the Freudian system is impregnated with the prejudice which it makes it its mission to fight -- the prejudice that everything sexual is vile.

What a country calls its vital economic interests are not the things which enable its citizens to live, but the things which enable it to make war. Petrol is more likely than wheat to be a cause of international conflict.

Everything which originates from pure love is lit with the radiance of beauty.

The lure of quantity is the most dangerous of all.