Selfishness is not merely physical self preservation — “For no man ever yet hated his own flesh; but nourisheth and cherisheth it, even as the Lord the church” (Ephesians 5:29 KJV) — for even Christ acted similarly. Then, loving yourself more than God first or your neighbor as yourself (Matthew 22:37-39) is the epitome of selfishness. For that reason, selfishness is the essence of sin.