Mark 8:33

(Vict. Ant. e Cat. in Marc.) But He saith not to the devil, when tempting Him, Get thee behind me, but to Peter He saith, Get thee behind me, that is, follow Me, and resist not the design of My voluntary Passion. There follows, For thou savourest not the things which be of God, but which be of men.

For the Lord, wishing to show that His Passion was to take place on account of the salvation of men, and that Satan alone was unwilling that Christ should suffer, and the race of man be saved, called Peter Satan, because he savoured the things that were of Satan, and, from unwillingness that Christ should suffer, became His adversary; for Satan is interpreted 'the adversary.' He says that Peter savours the things which be of men, in that he in some way savoured carnal affections, for Peter wished that Christ should spare Himself and not be crucified.

But how is this, that Peter, gifted with a revelation from the Father, has so soon fallen, and become unstable? Surely, however, it was not wonderful that one who had received no revelation concerning the Passion should be ignorant of this. For that He was the Christ, the Son of the living God, he had learnt by revelation; but the mystery of His cross and resurrection had not yet been revealed to him. He Himself, however, showing that He must come to His Passion, rebuked Peter; wherefore there follows, And when he had turned about and looked on his disciples, he rebuked Peter, &c.