Then He admonished the disciples not to tell anyone that He was the Christ.
Having given a proof of his future glory, Christ reminds his disciples of what he must suffer, that they also may be prepared to bear the cross; for the time was at hand when they must enter into the contest, to which he knew them to be altogether unequal, if they had not been fortified by fresh courage.
We have here a private conference which Christ had with his disciples concerning himself. It was in the coasts of Cesarea Philippi, the utmost borders of the land of Canaan northward; there in that remote corner, perhaps, there was less flocking after him than in other places, which gave him leisure for this private conversation with his disciples.
Commenting on Matthew 16:13-20
From that time forth began Jesus to show unto his disciples,.... From the time that Peter made the confession concerning Jesus, as that he was the Messiah, and Son of God, and which things were clear to all the apostles, he began to teach them more expressly, and to point out to them more clearly, and plainly, his sufferings and death, than he had done...