Hope.
"One day, when Epimetheus lay sleeping, Pandora stole the key and opened the box.
Out flew every kind of disease and sickness, hate and envy, and all the bad things that people had never experienced before. Pandora slammed the lid closed, but it was too late. All the bad things were already out of the box. They flew away, out into the world.
Epimetheus woke up at the sound of her sobbing. ?I opened the box and all these ugly things flew out,? she cried. ?I tried to catch them, but they all got out.? Pandora opened the box to show him how empty it was. But the box was not quite empty. One tiny bug flew quickly out before Pandora could slam the lid shut again.
?Hello, Pandora,? said the bug, hovering just out of reach. ?My name is Hope.? With a nod of thanks for being set free, Hope flew out into the world, a world that now held Envy, Crime, Hate, and Disease ? and Hope."