Our Lord teaches the apostles and all of us the best way to be great in the eyes of God. We must not let ourselves become corrupted by the world, the flesh, and the devil.
Mark 8:32-33 (32) Then Peter took him aside and began to rebuke him. (33) At this he turned around and, looking at his disciples, rebuked Peter and said, “Get behind me, Satan. You are thinking not as God does, but as human beings do.”