The contemporary form of true greatness lies in a civilization founded upon the spirituality of work.

All the tragedies which we can imagine return in the end to the one and only tragedy: the passage of time.

Every new development for the last three centuries has brought men closer to a state of affairs in which absolutely nothing would be recognized in the whole world as possessing a claim to obedience except the authority of the State. The majority of people in Europe obey nothing else.

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.

Patriotism is idolatry of the self.

One could count on one's fingers the number of scientists throughout the world with a general idea of the history and development of their particular science: there is none who is really competent as regards sciences other than his own. As science forms an indivisible whole, one may say that there are no longer, strictly speaking, scientists, but only drudges doing scientific work.

The right to kill: supposing the life of X ... were linked with our own so that the two deaths had to be simultaneous, should we still wish him to die? If with our whole body and soul we desire life and if nevertheless without lying, we can reply 'yes'> then we have the right to kill.