Every original idea is first ridiculed, then vigorously attacked, and finally taken for granted.

Philosophy ... is a science, and as such has no articles of faith; accordingly, in it nothing can be assumed as existing except what is either positively given empirically, or demonstrated through indubitable conclusions.

Every nation criticizes every other one - and they are all correct.

universal compassion is the only guarantee of morality.

Thus also every keen pleasure is an error and an illusion, for no attained wish can give lasting satisfaction.

That arithmetic is the basest of all mental activities is proved by the fact that it is the only one that can be accomplished by a machine.

Intellect is invisible to the man who has none.