"71. HOPE: Pandora brought the box of ills and opened it. It was the gift of the gods to men, outwardly a beautiful and seductive gift, and called the Casket of Happiness. Out of it flew all the evils, living winged creatures, thence they now circulate and do men injury day and night. One single evil had not yet escaped from the box, and by the will of Zeus Pandora closed the lid and it remained within. Now for ever man has the casket of happiness in his house and thinks he holds a great treasure; it is at his disposal, he stretches out his hand for it whenever he desires; for he does not know the box which Pandora brought was the casket of evil, and he believes the ill which remains within to be the greatest blessing, it is hope. Zeus did not wish man, however much he might be tormented by the other evils, to fling away his life, but to go on letting himself be tormented again and again. Therefore he gives Man hope,- in reality it is the worst of all evils, because it prolongs the torments of Man."
Friedrich Nietzsche (Human, All Too Human)