The science [geometry] is pursued for the sake of the knowledge of what eternally exists, and not of what comes for a moment into existence, and then perishes.

There are some whom the applause of the multitude has deluded into the belief that they are really statesmen.

True friendship can exist only between equals.

As there are misanthropists or haters of men, so also are there misologists, or haters of ideas.

The greatest penalty of evil-doing is to grow into the likeness of a bad man.

And we must beg Homer and the other poets not to be angry if we strike out these and similar passages, not because they are unpoetical, or unattractive to the popular ear, but because the greater the poetical charm in them, the less are they meet for the ears of boys and men who are meant to be free, and who should fear slavery more than death.

No attempt should be made to cure the body without the soul