Long ago, Jonathan Edwards proposed that Christians should unite. Such unity even more important today than it was then.
As 'tis the glory of the church of Christ, that she, in all her members, however dispersed, is thus one, one holy society, one city, one family, one body; so it is very desirable, that this union should be manifested, and become visible; and so, that her distant members should act as one, in those things that concern the common interest of the whole body, and in those duties and exercises wherein they have to do with their common Lord and Head, as seeking of him the common prosperity.
It becomes all the members of a particular family, who are so strictly united, and have in so many respects one common interest, to unite in prayer to God for the things they need: it becomes a nation, in days of prayer, appointed by national authority, at certain seasons, visibly to unite in Prayer for those public mercies that concern the interest of the whole nation: so it becomes the church of Christ, which is one holy nation, a Peculiar people, one heavenly family, more strictly united, in many respects, and having infinitely greater interests that are common to the whole, than any other society; I say, it especially becomes this society, visibly to unite, and expressly to agree together in prayer to God for the common prosperity; and above all, that common prosperity and advancement that is so unspeakably great and glorious, which God hath so abundantly promised to fulfill in the latter days.
It is becoming of Christians, with whose character a narrow selfish spirit, above all others, disagrees, to be much in prayer for that public mercy, wherein consists the welfare and happiness of the whole body of Christ, of which they are members, and the greatest good of mankind. And union or agreement in prayer is especially becoming, when Christians pray for that mercy, which above all other things concerns them unitedly, and tends to the relief, prosperity and glory of the whole body, as well as of each individual member.
Such an union in prayer for the general outpouring of the Spirit of God, would not only be beautiful, but profitable too. It would tend very much to promote union and charity between distant members of the church of Christ, and a public spirit, and love to the church of God, and concern for the interest of Zion; as well as be an amiable exercise and manifestation of such a spirit. Union in religious duties, especially in the duty of prayer, in praying one with and for another, and jointly for their common welfare, above almost all other things, tends to promote mutual affection and endearment.