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.

A work of art has an author and yet, when it is perfect, it has something which is anonymous about it.

Academic work is one of those fields which contain a pearl so precious that it is worth while to sell all our possessions, keeping nothing for ourselves, in order to be able to acquire it.

Prayer consists simply in giving to God all the careful attention of which the soul is capable.

Those who love a cause are those who love the life which has to be led in order to serve it.

Man alone can enslave man.

Imagination is always the fabric of social life and the dynamic of history. The influence of real needs and compulsions, of real interests and materials, is indirect because the crowd is never conscious of it.