Jesus is still teaching about becoming great in his kingdom: "If anyone would be first, he must be last of all and servant of all". But the life of a disciple is not just about outward service; it’s about inner change. There is a fundamental repentance when we turn to God for the first time and become Christians, and there is a lifelong ongoing repentance called mortification—putting to death our sins. We’re going to die either way, but one leads to eternal life, the other to eternal death. The result of truly hearing Jesus’ terrifying warnings is peace. He teaches these things because he loves us.