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. This self-arrogating ego is the real, hereditary sin of human nature. All evil Vrittis are hanging on this little ego. Papa is sin.