One might say that life is not perfect and always complane about how others' living.
"Why did he born so handsome while I'm not?"
"Why are their family so rich while we're not? "
Any many many more about the unfairness of the world.
Somehow there are many things that you should look into. Do not just see a matter from a side.
Hereby I would like to share something with you :
The Missing Piece