And he spake that saying openly
Concerning his sufferings, death, and resurrection from the dead.
He not only spoke it before them all, but in plain words, without
a figure; so that it might be, and was clearly understood by
them; and he spake it as the word will also bear, not only very
freely, but likewise boldly, with an undaunted courage, with
intrepidity of mind; being not in the least discouraged, nor
showing any concern or fear about what was to befall him:
and Peter took him, and began to rebuke him.
Peter might more especially be concerned at this free and open
account Christ gave of his sufferings and death, because he had
just now acquainted him, that he should have the keys of the
kingdom of heaven; by which he might understand some high post in
the temporal kingdom of the Messiah he expected; and immediately
to hear of his sufferings and death, damped his spirits, and
destroyed his hopes, and threw him into such difficulties he was
not able to remove; and therefore he takes Christ aside, and very
warmly expostulates with him about what he had said, and chides
him for it, and entreats him that he would not think, or talk of
such like things: the words of Peter are recorded by Matthew,
(See Gill on Matthew
16:22).