In an effort to dispel rumors about his identity, Jesus had a conversation with his disciples that made it clear he had come from heaven to earth for a specific purpose, to die for the sins of the world. Jesus began the conversation by asking his disciples, “Whom say the people that I am?” (Luke 9:18) and then asked, “But whom say ye that I am?” (Luke 9:20). The apostle Peter’s response is documented three different ways in the three gospels that have a record of this incident. I think Matthew, who was present at the time, captured it best when he said, “Thou art the Christ, the Son of the living God” (Mark 16:16). What Peter was saying was that Jesus was the Messiah, the savior God had promised to send to his people. Matthew went on to say, “And Jesus answered and said unto him, Blessed art thou, Simon Bar-jona: for flesh and blood hath not revealed it unto thee, but my Father which is in heaven” (Matthew 16:17).
Luke explained that the reason Jesus’ true identity was being kept a secret was because, “The Son of man must suffer many things, and be rejected of the elders and chief priests and scribes, and be slain, and be raised the third day” (Luke 9:22). In other words, it was dangerous for Jesus’ identity to be revealed because the religious leaders wanted to kill him in order to stop him from completing his mission of saving the world. After Peter made his confession of faith, Jesus told him, “And I say unto thee, That thou art Peter, and upon this rock will I build my church; and the gates of hell shall not prevail against it. And I will give unto thee the keys of the kingdom of heaven: and whatsoever thou shalt bind on earth shall be bound in heaven: and whatsoever thou shalt loose on earth shall be loosed in heaven” (Mark 16:18-19).
Keys are only mentioned twice in the Bible, in the conversation Jesus had with his disciples about his identity and in Revelation 1:18 where Jesus said, “I am he that liveth, and was dead; and, behold I am alive for evermore, Amen; and have the keys of hell and death.” The keys to the kingdom of heaven and the keys to hell were both given to Jesus, the Messiah, who was also know as the anointed one, God’s designated representative. It was in his role as Messiah that Jesus obtained access to heaven for all mankind. When Jesus told Peter that he would give him the keys of the kingdom of heaven, he was essentially saying that Peter, and anyone else that confessed that he was the Messiah, would be able to have direct access to God for all eternity. Jesus’ reference to things being bound and loosed on earth and in heaven had to do with sin and its power to separate us from God.
So that his disciples would understand that access to God was not something to be taken lightly, Jesus said:
If any man will come after me, let him deny himself, and take up his cross daily, and follow me. For whosoever will save his life shall lose it: but whosoever will lose his life for my sake, the same shall save it. For what is a man advantaged, if he gain the whole world, and lose himself, or be cast away? For whosoever shall be ashamed of me and of my words, of him shall the Son of man be ashamed, when he shall come in his own glory, and in his Father’s, and of the holy angels. (Luke 9:23-26)
The phrase Jesus used “take up his cross daily” meant to undergo suffering, trial, punishment, to expose oneself to reproach and death. In other words, to allow oneself to be treated in the same way that Jesus was. Matthew’s version of Jesus’ admonition included an incentive. He stated, “For the Son of man shall come in the glory of his Father with his angels: and then he shall reward every man according to his works” (Matthew 16:27). The Greek word that is translated works, praxis means practice and by extension a function (4234). Another way of referring to works could be an assignment or regular duty. I think what Jesus was implying was that the more we exercise our faith on earth, the more we will see the results of it in heaven.