I believe that when death closes our eyes we shall awaken to a light, of which our sunlight is but the shadow.

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.

There are, first of all, two kinds of authors: those who write for the subject's sake, and those who write for writing's sake.

You are free to do what you want, but you are not free to want what you want.

The nobler and more perfect a thing is, the later and slower it is in arriving at maturity. A man reaches the maturity of his reasoning powers and mental faculties hardly before the age of twenty-eight; a woman at eighteen.

We may divide thinkers into those who think for themselves and those who think through others. The latter are the rule and the former the exception. The first are original thinkers in a double sense, and egotists in the noblest meaning of the word.

Truth is no harlot who throws her arms round the neck of him who does not desire her; on the contrary, she is so coy a beauty that even the man who sacrifices everything to her can still not be certain of her favors.