Adam and Eve, the first people on Earth before the devil screwed things up. They lived in Eden, a perfect place with no sin or unhappiness. After the fall, sin arrived and they were kicked out, only then did they realize how good they really had it. Think about it, a rich kid gets a new iPhone, and he grunts and leaves with it; but a very poor inner-city child will get a salvation army coat so he will be warm, and he cries with joy at the wonderful thing that has just happened to him. If we lived in a perfect world, once we all got to heaven, it would be the same, and we wouldnt appreciate it at all.