Every parting gives a foretaste of death, every reunion a hint of the resurrection. - Arthur Schopenhauer

In every page of David Hume, there is more to be learned than from Hegel's, Herbart's and Schleiermacher's complete philosophical works. - vol. II, p. 582 (as cited on p. 177 of Schopenhauer: A Biography)

Unless suffering is the direct and immediate object of life, our existence must entirely fail of its aim. It is absurd to look upon the enormous amount of pain that abounds everywhere in the world, and originates in needs and necessities inseparable from life itself, as serving no purpose at all and the result of mere chance. Each separate misfortune, as it comes, seems, no doubt, to be something exceptional; but misfortune in general is the rule.
I know of no greater absurdity than that propounded by most systems of philosophy in declaring evil to be negative in its character. Evil is just what is positive; it makes its own existence felt.

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. [...] The truth is that when an author begins to write for the sake of covering paper, he is cheating the reader; because he writes under the pretext that he has something to say.