We feel it to be of real moment to insist upon this principle, namely, that the _only_ ground on which we can believe any doctrine is its being revealed in the divine Word. It is thus we believe all the great truths of Christianity. We know nothing and can believe nothing of what is spiritual, heavenly, or divine, save as we find it revealed in the word of God. How do I know I am a sinner? Because Scripture hath declared that "all have sinned." No doubt I feel that I am a sinner; but I do not believe because I feel, but I feel because I believe, and I believe because God has spoken. Faith rests upon divine revelation, not on human feelings or human reasonings. "It is written" is quite sufficient for faith. It can do with nothing less, but it asks nothing more. God speaks: faith believes. Yes, it believes simply because God speaks. It does not judge God's Word by outward appearances, but it judges outward appearances by the word of God.
Thus it is in reference to all the cardinal truths of the Christian religion, such as the Trinity, the deity of our Lord Jesus Christ, His atonement, His priesthood, His advent, the doctrine of original sin, of justification, judgment to come, eternal punishment. We believe these grand and solemn truths, not on the ground of feeling, of reason, or of outward appearances, but simply on the ground of divine revelation.
Hence, then, if it be asked, On what ground do we believe in the doctrine of the unity of the body? we reply, Upon the self-same ground that we believe the doctrine of the Trinity, the deity of Christ, and the atonement. We believe it because it is revealed in sundry places in the New Testament. Thus, for example, in 1 Cor. xii. we read, "For as _the body is one_, and hath many members, and all the members of that _one body_, being many, are _one body_; so also _is Christ_. For by one Spirit are we all baptized into _one body_, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into one Spirit." Again, "God hath tempered the body together, having given more abundant honor to that part which lacked, that there should be no schism in the body.... Now, _ye are the body of Christ_, and members in particular."
Here we have distinctly laid down the perfect and indissoluble unity of the Church of God, the body of Christ, on precisely the same authority as any other truth commonly received amongst us; so that there is just as much ground for calling in question the deity of Christ as there is for calling in question the unity of the body. The one is as true as the other; and both are divinely true, because divinely revealed. We believe that Jesus Christ is God over all, blessed forever, because Scripture tells us so; we believe that there is one body because Scripture tells us so. We do not reason in the one case, but believe and bow; nor should we reason in the other case, but believe and bow. "There is one body and one Spirit."
Now, we must bear in mind that this truth of the unity of the body is not a mere abstraction--a barren speculation--a powerless dogma. It is a practical, formative, influential truth, in the light of which we are called to walk, to judge ourselves and all around us. It was so with the faithful in Israel of old. The unity of the nation was a real thing to them, and not a mere theory to be taken up or laid down at pleasure. It was a great formative, powerful truth. The nation was one in God's thoughts; and if it was not manifestly so, the faithful had only to take the place of self-judgment, brokenness of spirit, and contrition of heart. Witness the case of Hezekiah, Josiah, Daniel, Nehemiah, and Ezra. It never once occurred to these faithful men that they were to give up the truth of Israel's unity because Israel had failed to maintain it. They did not measure the truth of God by the actings of men; but they judged the actings of men, and themselves likewise, by the truth of God. This was the only true way to act. If the manifested unity of Israel was marred through man's sin and folly, the true-hearted members of the congregation owned and mourned over the sin, confessed it as their own, and looked to God. Nor was this all. They felt their responsibility to act on the truth of God whatever might be the outward condition of things.