It is easier to produce ten volumes of philosophical writings than to put one principle into practice.

Prayer is addressed to the personal God, not because he is personal indeed, I know for certain that he is not personal, because personality is limitation, while God is unlimited.

Prayer is an invisible tool which is wielded in a visible world.

Real wisdom is not the knowledge of everything, but the knowledge of which things in life are necessary, which are less necessary, and which are completely unnecessary to know.

Mathematics is the queen of disciplines.... it will drive the nonsense out of your head!

It would, therefore, seem obvious that patriotism as a feeling is bad and harmful, and as a doctrine is stupid. For it is clear that if each people and each State considers itself the best of peoples and States, they all live in a gross and harmful delusion.

And where love ends, hate begins