Thus our dignity consists in thought. It is on thought that we must depend for our recovery, not on space and time, which we could never fill. Let us then strive to think well; that is basic principle of morality. (54)

I would prefer an intelligent hell to a stupid paradise.

Man’s greatness come from knowing he wretched: a tree does not know it is wretched. (21)

Those great efforts of intellect, upon which the mind sometimes touches, are such that it cannot maintain itself there. It only leaps to them, not as upon a throne, forever, but merely for an instant.