Peter says Jesus is the Christ;
Jesus tells His disciples to deny themselves
These few verses are filled with significant events. Peter made his great confession that Jesus is “the Christ.” But when Jesus told his disciples that he would be killed, Peter took him to task, and Jesus used the same words with Peter that Luke recorded him using when the devil tempted him: “Get thee behind me, Satan.” Jesus then explained that his followers must deny themselves, “for what shall it profit a man, if he shall gain the whole world and lose his own soul.”
And Jesus went out, and his disciples, into the towns of Caesarea Philippi: and by the way he asked his disciples, saying unto them, Whom do men say that I am? And they answered, John the Baptist; but some say, Elias; and others, One of the prophets. And he saith unto them, But whom say ye that I am? And Peter answereth and saith unto him, Thou art the Christ. And he charged them that they should tell no man of him.
And he began to teach them, that the Son of man must suffer many things, and be rejected of the elders, and of the chief priests, and scribes, and be killed, and after three days rise again. And he spake that saying openly. And Peter took him, and began to rebuke him. But when he had turned about and looked on his disciples, he rebuked Peter, saying, Get thee behind me, Satan: for thou savourest not the things that be of God, but the things that be of men.
And when he had called the people unto him with his disciples also, he said unto them, Whosoever will come after me, let him deny himself, and take up his cross, and follow me. For whosoever will save his life shall lose it; but whosoever shall lose his life for my sake and the gospel's, the same shall save it. For what shall it profit a man, if he shall gain the whole world, and lose his own soul? Or what shall a man give in exchange for his soul? Whosoever therefore shall be ashamed of me and of my words in this adulterous and sinful generation; of him also shall the Son of man be ashamed, when he cometh in the glory of his Father with the holy angels.