By telling his disciples that he must suffer and be put to death, and then rise again, Jesus wants to make them understand his true identity. He is a Messiah who suffers, a Messiah who serves, and not some triumphant political saviour. He is the Servant who obeys his Father’s will, even to giving up his life. This had already been foretold by the prophet Isaiah in today’s first reading. Jesus thus contradicts the expectations of many. What he says is shocking and disturbing. We can understand the reaction of Peter who rebukes him, refusing to accept that his Master should suffer and die! Jesus is stern with Peter; he makes him realize that anyone who would be his disciple must become a servant, just as he became Servant.
Following Jesus means taking up one’s cross and walking in his footsteps, along a difficult path which leads not to earthly power or glory but, if necessary, to self-abandonment, to losing one’s life for Christ and the Gospel in order to save it. We are assured that this is the way to the resurrection, to true and definitive life with God. Choosing to walk in the footsteps of Jesus Christ, who made himself the Servant of all, requires drawing ever closer to him, attentively listening to his word and drawing from it the inspiration for all that we do.
[Pope Benedict, homily in Beirut 16 September 2012]