From that time forth began Jesus to show unto his disciples, how that he must go unto Jerusalem, and suffer many things of the elders and chief priests and scribes, and be killed, and be raised again the third day.
All Commentaries on Matthew 16:21 Go To Matthew 16
John Chrysostom
AD 407
But not even so did they understand what He said. For the saying, it is said, was hid from them; Luke 18:34 and they were as in a kind of perplexity, not knowing that He must rise again. Therefore He rather dwells on the difficulties, and enlarges His discourse, that He may open their mind, and they may understand what it can be that He speaks of.