There are three categories that humans fit into. A human is either a slave, man, or parasite. The slave completes work without any benefit for himself. He works to help all others before himself, he erases himself as an individual. The parasite forces others to become slaves for him. He sacrifices others onto himself for his own benefit. He is the worst of humanity. Unlike the slave who offers up his happiness to the world voluntarily, the parasite takes other's happiness away without any remorse. The true man walks the line between slave and parasite. He neither gives himself to others freely nor takes others onto himself. He has an ego, which advocates rational selfishness, and he works to benefit himself, neither at the expense of others or himself.
There is bonus fun to be had in his grappling with Adam Smith. More recent efforts are less satisfying. What, is he 13?