"The wisdom that is from above is first pure, then peaceable;" accordingly we are first shown how to proceed in order to preserve the purity of the Church. Then instructions are given with a view to preserve the peace of the Church. The first paragraph shows how to exercise discipline; the second lays down the Christian rule of forgiveness.
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"If thy brother shall trespass against thee,"--what? Pay no heed to it? Since it takes two to make a quarrel, is it best simply to let him alone? That might be the best way to deal with offences on the part of those that are without; but it would be a sad want of true brotherly love to take this easy way with a fellow-disciple. It is certainly better to overlook an injury than to resent it; yet our Lord shows a more excellent way. His is not the way of selfish resentment, nor of haughty indifference; but of thoughtful concern for the welfare of him who has done the injury. That this is the motive in the entire proceeding is evident from the whole tone of the paragraph, in illustration of which reference may be made to the way in which success is regarded: "If he shall hear thee, thou hast gained thy brother." If a man sets out with the object of gaining his cause or getting satisfaction, he had better let it alone; but if he wishes not to gain a barren triumph for himself, but to gain his brother, let him proceed according to the wise instructions of our Lord and Master.
There are four steps: (1) "Go and tell him his fault between thee and him alone." Do not wait till he comes to apologise, as is the rule laid down by the rabbis, but go to him at once. Do not think of your own dignity. Think only of your Master's honour and your brother's welfare. How many troubles, how many scandals might be prevented in the Christian Church, if this simple direction were faithfully and lovingly carried out! In some cases, however, this may fail; and then the next step is: (2) "Take with thee one or two more, that in the mouth of two or three witnesses every word may be established." The process here passes from private dealing; still there must be no undue publicity. If the reference to two or at most three (see R.V.) fail, it becomes a duty to (3) "tell it unto the church," in the hope that he may submit to its decision. If he decline, there is nothing left but (4) excommunication: "Let him be unto thee as an heathen man and a publican."
The mention of church censure naturally leads to a declaration of the power vested in the church in the matter of discipline. Our Lord had already given such a declaration to Peter alone; now it is given to the church as a whole in its collective capacity: "Verily I say unto you, Whatsoever ye shall bind on earth shall be bound in heaven: and whatsoever ye shall loose on earth shall be loosed in heaven." But the question comes: What is the church in its collective capacity? If it is to have this power of discipline, of the admission and rejection of members--a power which, rightly exercised on earth, is ratified in heaven--it is important to know something as to its constitution. This much, indeed, we know: that it is an assembly of believers. But how large must the assembly be? What are the marks of the true church?
These questions are answered in vv. 19 and 20. It is made very plain that it is no question of numbers, but of union with one another and the Lord. Let it be remembered that the whole discourse has grown out of the strife with one another which should be the greatest. Our Lord has already shown that, instead of ambition to be the greatest, there must be readiness to be the least. He now makes it plain that instead of strife and division there must be agreement, unity in heart and desire. But if only there be this unity, this blending of hearts in prayer, there is found the true idea of the Church. Two disciples in full spiritual agreement, with hearts uplifted to the Father in heaven, and Christ present with them,--there is what may be called the primitive cell of the Church, the body of Christ complete in itself, but in its rudimentary or germinal form. It comes to this, that the presence of Christ with His people and of His spirit in them, uniting them with one another and with Him, is that which constitutes the true and living church; and it is only when thus met in the name of Christ, and acting in the spirit of Christ, that assemblies of believers, whether large or small, have any guarantee that their decrees on earth are registered in heaven, or that the promise shall be fulfilled to them, that what they ask "shall be done for them of My Father which is in heaven."