Socrates 120. As for me, all I know is that I know nothing, for when I don't know what justice is, I'll hardly know whether it is a kind of virtue or not, or whether a person who has it is happy or unhappy. ShuShen Rean: Because ordinary people feel happy or sad, and they attach them so mush, than the feelings lead them into infinite reincarnations, too. So, theirs happies and sad have no meanings at all.