All metaphysical optimism, such as that of Leibnitz, and all metaphysical pessimism, such as that of Schopenhauer, have no other foundation than this.
Baikortasun metafisiko orok, Leibnitzena bezalakoa, edo maila bereko ezkortasunak, Schopenhauerrena bezalakoa, ez dute beste oinarririk.