Jesus spoke the following words while teaching in the synagogue in Capernaum. The words were shocking, no doubt deliberately so.
Then Jesus said unto them, Verily, verily, I say unto you, Except ye eat the flesh of the Son of man, and drink his blood, ye have no life in you. Whoso eateth my flesh, and drinketh my blood, hath eternal life; and I will raise him up at the last day. For my flesh is meat indeed, and my blood is drink indeed. He that eateth my flesh, and drinketh my blood, dwelleth in me, and I in him. As the living Father hath sent me, and I live by the Father: so he that eateth me, even he shall live by me. This is that bread which came down from heaven: not as your fathers did eat manna, and are dead: he that eateth of this bread shall live for ever. (John 6:53-58)
Many who had been following Jesus turned away. These mysterious words didn’t sound at all like the Messiah they had been taught to expect. When Jesus asked the twelve if they would also turn away, Peter responded “Lord, to whom shall we go? thou hast the words of eternal life. And we believe and are sure that thou art that Christ, the Son of the living God.”
The apostle Paul explained the mystery like this in Colossians 1:26-27: “Even the mystery which hath been hid from ages and from generations, but now is made manifest to his saints: to whom God would make known what [is] the riches of the glory of this mystery among the Gentiles; which is Christ in you, the hope of glory.”
The key to understanding Messiah’s kingdom is that the citizens of this kingdom are people who have Jesus Christ inside of them, ruling their lives from the heart. Every time a person is born again, the Lord Jesus Christ is incarnate within them.
This was Jesus’ promise to His disciples in John 14:16-18: “And I will pray the Father, and he shall give you another Comforter, that he may abide with you for ever; Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you. I will not leave you comfortless: I will come to you.” He repeats the promise in His prayer in the 17th chapter of John: “I in them, and thou in me, that they may be made perfect in one; and that the world may know that thou hast sent me, and hast loved them, as thou hast loved me.”
Paul explains the promise a little further in Romans chapter eight: “ But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you. Now if any man have not the Spirit of Christ, he is none of his. And if Christ be in you, the body is dead because of sin; but the Spirit is life because of righteousness. But if the Spirit of him that raised up Jesus from the dead dwell in you, he that raised up Christ from the dead shall also quicken your mortal bodies by his Spirit that dwelleth in you.” (Verses 9-11).
The promise is that the believer will have both the Holy Spirit and Jesus Christ dwelling in him or her. “He (the Holy Spirit) shall be in you / I (Jesus) will come to you.” “If so be that the Spirit of God dwell in you / And if Christ be in you.”
I believe this is what the apostle John is speaking of in the following verses: “Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God: and every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, whereof ye have heard that it should come; and even now already is it in the world” (1 John 4:2-3). I don’t think he is saying that it is enough to believe that Jesus once walked this earth in human flesh. We must know that He is here right now, in my flesh and your flesh, if we are Christians.
“Where there is neither Greek nor Jew, circumcision nor uncircumcision, Barbarian, Scythian, bond nor free: but Christ is all, and in all” (Colossians 3:11). Christ is in every Christian, no matter our ethnic background, social or economic status. This is the identifying mark of the true Christian, recognizable only by other Christians.