"The divisions of Christians (as a learned man observes) are a scandal to the Jews, an opprobrium to the Gentiles, and an inlet to atheism and infidelity:" insomuch that our controversies about religion (especially as they have been of late managed) have made religion itself become a controversy. O then, how good and pleasant a thing is it for brethren to dwell together in unity! The peace and unity that was among the primitive Christians drew others to them. What hinders the conversion of the Jews, but the divisions of Christians? Must I be a Christian? says the Jew. What Christian must I be? what sect must I be of? The Jews (as one observes), glossing upon that text in Isa. xi. 6, where it is prophesied, That the lion and the lamb shall lie down together, and that there shall be none left to hurt nor destroy in all God's holy mountain: they interpreting these sayings to signify the concord and peace that shall be among the people that shall own the Messiah, do from hence conclude, that the Messiah is not yet come, because of the contentions and divisions that are among those that profess him. And the apostle saith, 1 Cor. xiv. 23, that if an unbeliever should see their disorders, he would say they were mad; but where unity and peace is, there the churches are multiplied. We read, Acts ix., that when the churches had rest, they multiplied; and Acts ii. 46, 47, when the church was serving God with one accord, "the Lord added to them daily such as should be saved."
It is unity brings men into the church, and divisions keep them out. It is reported of an Indian, passing by the house of a Christian, and hearing them contending, being desired to turn in, he refused, saying, "Habamach dwells there," meaning that the devil dwelt there: but where unity and peace is, there God is; and he that dwells in love, dwells in God. The apostle tells the Corinthians, that if they walked orderly, even the unbelievers would hereby be enforced to come and worship, and say, God was in them indeed. And we read, Zech. viii. 23, of a time when ten men shall take hold of a Jew, and say, "We will go with you, for we have heard that God is with you."
And hence it is that Christ prays, John xvii. 21, that his disciples might be one, as the Father and he were one, that the world might believe the Father sent him: as if he should say, you may preach me as long as you will, and to little purpose, if you are not at peace and unity among yourselves. Such was the unity of Christians in former days, that the intelligent heathen would say of them, that though they had many bodies, yet they had but one soul. And we read the same of them, Acts iv. 32, that "the multitude of them that believed were of one heart and one soul."
And as the learned Stillingfleet observes in his Irenicum: "The unity and peace that was then among Christians made religion amiable in the judgment of impartial heathens: Christians were then known by the benignity and sweetness of their dispositions, by the candour and ingenuity of their spirits, by their mutual love, forbearance, and condescension to one another. But either this is not the practice of Christianity (viz., a duty that Christians are now bound to observe), or else it is not calculated for our meridian, where the spirits of men are of too high an elevation for it; for if pride and uncharitableness, if divisions and strifes, if wrath and envy, if animosities and contentions, were but the marks of true Christians, Diogenes need never light his lamp at noon to find out such among us; but if a spirit of meekness, gentleness, and condescension, if a stooping to the weaknesses and infirmities of one another, if pursuit after peace, when it flies from us, be the indispensable duties, and characteristical notes of Christians, it may possibly prove a difficult inquest to find out such among the crowds of those that shelter themselves under that glorious name."
It is the unity and peace of churches that brings others to them, and makes Christianity amiable. What is prophesied of the church of the Jews may in this case be applied to the Gentile church, Isa. lxvi. 12, that when once God extends peace to her like a river, the Gentiles shall come in like a flowing stream; then (and not till then) the glory of the Lord shall arise upon his churches, and his glory shall be seen among them; then shall their hearts fear and be enlarged, because the abundance of the nations shall be converted to them.
6. As want of unity and peace keeps those out of the church that would come in, so it hinders the growth of those that are in. Jars and divisions, wranglings and prejudices, eat out the growth, if not the life of religion. These are those waters of Marah, that embitter our spirits, and quench the Spirit of God. Unity and peace is said to be like the dew of Hermon, and as a dew that descended upon Sion, where the Lord commanded his blessing; Psalm cxxxiii. 3.