21 From then on Jesus began to tell his disciples plainly that it was necessary for him to go to Jerusalem, and that he would suffer many terrible things at the hands of the elders, the leading priests, and the teachers of religious law. He would be killed, but on the third day he would be raised from the dead. 22 But Peter took him aside and began to reprimand him for saying such things. "Heaven forbid, Lord," he said. "This will never happen to you!" 23 Jesus turned to Peter and said, "Get away from me, Satan! You are a dangerous trap to me. You are seeing things merely from a human point of view, not from God's."
Matthew Henry's Commentary on Matthew 16:21-23
Commentary on Matthew 16:21-23
(Read Matthew 16:21-23)
Christ reveals his mind to his people gradually. From that time, when the apostles had made the full confession of Christ, that he was the Son of God, he began to show them of his sufferings. He spake this to set right the mistakes of his disciples about the outward pomp and power of his kingdom. Those that follow Christ, must not expect great or high things in this world. Peter would have Christ to dread suffering as much as he did; but we mistake, if we measure Christ's love and patience by our own. We do not read of any thing said or done by any of his disciples, at any time, that Christ resented so much as this. Whoever takes us from that which is good, and would make us fear to do too much for God, speaks Satan's language. Whatever appears to be a temptation to sin, must be resisted with abhorrence, and not be parleyed with. Those that decline suffering for Christ, savour more of the things of man than of the things of God.