And why are you so firmly, so triumphantly, convinced that only the normal and the positive--in other words, only what is conducive to welfare--is for the advantage of man? Is not reason in error as regards advantage? Does not man, perhaps, love something besides well-being? Perhaps he is just as fond of suffering? Perhaps suffering is just as great a benefit to him as well-being? Man is sometimes extraordinarily, passionately, in love with suffering, and that is a fact.
Fyodor DostoevskyIt sometimes happened that you might be familiar with a man for several years thinking he was a wild animal, and you would regard him with contempt. And then suddenly a moment would arrive when some uncontrollable impulse would lay his soul bare, and you would behold in it such riches, such sensitivity and warmth, such a vivid awareness of its own suffering and the suffering of others, that the scales would fall from your eyes and at first you would hardly be able to believe what you had seen and heard. The reverse also happens.
Fyodor Dostoevsky