They goad and afflict a careless or a foolish man. They attack him powerfully, like a tiger jumping upon its prey. From these originate all sorts of grief and sin. It is selfishness that prompts a man to do evil acts. A selfish man injures others, robs their property, and does many sinful actions to satisfy his selfishness.
Selfishness is the devil incarnate in every man.
It is a sin to be pleased with oneself. By shutting out the possibility of progress, self-inquiry, and introspection, the process of degeneration sets in. Egoism is the greatest sin. This one thought has multiplied into thousandfold thoughts. This one thought separated man from God.