Convictions can best be supported with experience and clear thinking.

The supreme goal of all theory is to make the irreducible basic elements as simple and as few as possible without having to surrender the adequate representation of a simple datum of experience.

All our thinking is of this nature, a free play with concepts.

The only source of knowledge is experience.

Concepts that have proven useful in ordering things easily achieve such authority over us that we forget their earthly origins and accept them as unalterable givens.

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.

If you want your children to be intelligent, read them fairy tales. If you want them to be more intelligent, read them more fairy tales.