Story of time 

People who have been at the bottom of the society know how cruel the competition is at the bottom, how serious the fight is, and how fierce the fight is. The bottom to see the ugly side of human nature more, everyone in order to survive to die, there is no family friendship, any vital interests can immediately turn against people, even if there is no interest, as long as you live a little different, you also don’t want to have quiet. Maybe just why the people who see through them want to try to get out of the bottom.