With the idea of all Divine truth bearing an intimate relation to Christ agrees that notable phrase in Eph. 4:21, “The truth as it is in Jesus.” To believe the truth concerning Jesus is to believe the whole doctrine of the Scriptures. Hence it is that in all the brief summaries of Christian doctrine the person and work of Christ are prominent. Such are the following: “Brethren, I declare unto you the gospel which I preached unto you, which also you have received, and wherein ye stand; by which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain. For I delivered unto you, among the first principles, that which I also received, how that Christ died for our sins according to the Scriptures.—Great is the mystery of godliness, God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory.—This is a faithful saying, and worthy of all acceptation, that Jesus Christ came into the world to save sinners, of whom I am chief.—This is the record, that God hath given unto us eternal life, and this life is in his Son.—He that believeth that Jesus is the Christ is born of God.—Who is he that overcometh the world, but he that believeth that Jesus is the Son of God?” Fully aware that this golden link would draw along with it the whole chain of evangelical truth, the sacred writers seem careful for nothing in comparison of it. It is on this ground that faith in Christ is represented as essential to spiritual life: see John 6:53–56, “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.” We may be Christians by education, may be well versed in Christianity as a science, may be able to converse, and preach, and write, in defence of it; but if Christ crucified be not that to us which food is to the hungry, and drink to the thirsty, we are dead while we live. It is on this ground that error concerning the person and work of Christ is of such importance as frequently to become death to the party. We may err on other subjects and survive, though it be in a maimed state; but to err in this is to contract a disease in the vitals, the ordinary effect of which is death. When Peter confessed him to be the Son of the living God, Jesus answered, “Upon this rock will I build my church, and the gates of hell shall not prevail against it.” Upon this principles, as a foundation, Christianity rests; and it is remarkable that, to this day, deviation concerning the person and work of Christ is followed by a dereliction of almost every other evangelical doctrine, and of the spirit of Christianity. How should it be otherwise? If the foundation be removed, the building must fall.
What is it that is denominated the great mystery of godliness? Is it not that “God was manifest in the flesh, justified in the Spirit, seen of angels, preached unto the Gentiles, believed on in the world, received up into glory?” It is this that the apostle John introduces at the beginning of his gospel under the name of “the Word:” “The Word was with God, and was God; by whom all things were made, and who was made flesh, and dwelt among us.”* It is this upon which he dwells in the introduction of his First Epistle: “That which was from the beginning, which we have heard, which we have seen with our eyes, which we have looked upon, and our hands have handled, of the word of life; (for the life was manifested, and we have seen it, and bear witness, and show unto you that eternal life, which was with the Father, and was manifested unto us;) that which we have seen and heard declare we unto you, that ye also may have fellowship with us; and truly our fellowship is with the Father, and with his Son Jesus Christ.” Christ is here described, 1. As to what he was in his pre-incarnate state; namely, as that which was from the beginning, the word of life, and that eternal life which was with the Father. 2. As to what he became by his incarnation: he was so manifested that his disciples could see him, and look on him, and handle him; and thus be qualified to bear witness of him, and to show unto others that eternal life that was with the Father. 3. As having opened a way in which those who believed in him were admitted to fellowship with God, and with him, and were commissioned to invite others to partake with them. I have long considered this passage as a decisive proof of the Divinity of Christ, and as a summary of the gospel.
Fuller, A. G. (1988). The Complete Works of Andrew Fuller: Memoirs, Sermons, Etc. (J. Belcher, Ed.) (Vol. 1, pp. 691–692). Harrisonburg, VA: Sprinkle Publications.