Non-cooperation in military matters should be an essential moral principle for all true scientists.

The future is not a gift-it is an achievement.

Whatever there is of God and goodness in the universe, it must work itself out and express itself through us. We cannot stand aside and let God do it.

This is what the painter, the poet, the speculative philosopher, and the natural scientists do, each in his own fashion.

In theory, theory and practice are the same. In practice, they are not.

It seems to me an utterly futile task to prescribe rules and limitations for the conduct of war. War is not a game; hence one cannot wage war by rules as one would in playing games. Our fight must be against war itself. The masses of people can most effectively fight the institution of war by establishing an organization for the absolute refusal of military service.

The more a man is imbued with the ordered regularity of all events the firmer becomes his conviction that there is no room left by the side of this ordered regularity for causes of a different nature. For him neither the rule of human nor the rule of divine will exist as an independent cause of natural events.