Any lesser or gentler rebuke to Peter would have been a disservice to him, underplaying the seriousness of his actions.
Peter’s strength of character also requires a sustained moulding process.
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The transformation of Simon, a Galilean fisherman, to Peter, leader of a religious movement prepared to challenge and defy the Jewish and Roman authorities, is a story of enduring power and has provided hope and inspiration for Christians throughout the ages.
A further explanation is that Jesus knows Peter’s need to accept Jesus’ words and authority if he is to become the rock and fisher of men that he should.
Peter unwittingly stands in opposition to the central act of Jesus’ vocation from the Father and needs to understand the peril of doing so.
Peter’s Confession And Jesus’ Rebuke A crucial moment in the relationship between Jesus and Peter is Peter’s confession.
Luke often shows Jesus in prayer at key points, including prior to Peter’s confession.
However, when Peter presumes to take Jesus to one side and rebuke him for talking of dying, Jesus’ response is sharp and immediate ‘Get behind me Satan!
 Walking On Water Peter’s strength of character was also an asset and on another occasion we see Jesus seeking to channel it towards a deeper faith.