“Peter thought, if He was the Son of God, why should He suffer?  Satan on the mount of temptation tempted Him from His cross by promising popularity through giving bread, working scientific marvels, or becoming a dictator.  Satan did no confess the Divinity of Christ, since he prefaced each temptation with an ‘if’ thou art the Son of God.  To the credit of Peter, he did confess Divinity.  But along with this difference, there was this likeness: both Peter and satan tempted Christ from His Cross and therefore from redemption.  Not to redeem was satan’s mind; to have the crown without the Cross was satan’s spirit.  But, it was also Peter’s.  Therefore, Our Lord called him satan.   Archbishop Fulton Sheen (Life of Christ)