" Living as we do on this side of the cross, it is easy for us to be a bit condescending about Peter's reaction and rebuke of the Master (8:32). From Peter's perspective, Jesus simply had to be wrong on this subject. After all, messiahs don't get killed: they win. And how could a God-anointed, miracle-working Messiah like Jesus lose? Peter was wrong, of course, profoundly wrong. For even the disciples had not yet grasped that Jesus the Messiah was simultaneously conquering King and Suffering Servant. "

― D.A. Carson , For the Love of God (Vol. 1), 1: A Daily Companion for Discovering the Riches of God's Word