What awful and distressing effects have those sad divisions produced! what aversions, what reproaches, what backbitings, what evil surmisings, what angry contentions, what enmities, what excommunications, and even persecution!!! And, indeed, this must, in some measure, continue to be the case so long as those schisms exist; for, saith the apostle, where envying and strife is, there is confusion and every evil work. What dreary effects of those accursed divisions are to be seen, even in this highly favored country, where the sword of the civil magistrate has not as yet learned to serve at the altar. Have we not seen congregations broken to pieces, neighborhoods of professing Christians first thrown into confusion by party contentions, and, in the end, entirely deprived of Gospel ordinances; while, in the mean time, large settlements and tracts of country remain to this day entirely destitute of a Gospel ministry, many of them in little better than a state of heathenism, the Churches being either so weakened with divisions that they can not send them ministers, or the people so divided among themselves that they will not receive them. Several, at the same time, who live at the door of a preached Gospel, dare not in conscience go to hear it, and, of course, enjoy little more advantage, in that respect, than if living in the midst of heathens. How seldom do many in those circumstances enjoy the dispensations of the Lord's Supper, that great ordinance of unity and love. How sadly, also, does this broken and confused state of things interfere with that spiritual intercourse among Christians, one with another, which is so essential to their edification and comfort, in the midst of a present evil world; so divided in sentiment, and, of course, living at such distances, that but few of the same opinion, or party, can conveniently and frequently assemble for religious purposes, or enjoy a due frequency of ministerial attentions. And even where things are in a better state with respect to settled Churches, how is the tone of discipline relaxed under the influence of a party spirit; many being afraid to exercise it with due strictness, lest their people should leave them, and, under the cloak of some specious pretense, find refuge in the bosom of another party; while lamentable to be told, so corrupted is the Church with those accursed divisions, that there are but few so base as not to find admission into some professing party or other. Thus, in a great measure, is that Scriptural purity of communion banished from the Church of God, upon the due preservation of which much of her comfort, glory, and usefulness depend. To complete the dread result of our woeful divisions, one evil yet remains, of a very awful nature: the Divine displeasure justly provoked with this sad perversion of the Gospel of peace, the Lord withholds his gracious influential presence from his ordinances, and not unfrequently gives up the contentious authors and abettors of religious discord to fall into grievous scandals, or visits them with judgments, as he did the house of Eli. Thus, while professing Christians bite and devour one another, they are consumed one of another, or fall a prey to the righteous judgments of God; meantime, the truly religious of all parties are grieved, the weak stumbled, the graceless and profane hardened, the mouths of infidels opened to blaspheme religion, and thus the only thing under heaven divinely efficacious to promote and secure the present spiritual and eternal good of man, even the Gospel of the blessed Jesus, is reduced to contempt, while multitudes, deprived of a Gospel ministry, as has been observed, fall an easy prey to seducers, and so become the dupes of almost unheard of delusions. Are not such the visible effects of our sad divisions, even in this otherwise happy country. Say, dear brethren, are not these things so? Is it not then your incumbent duty to endeavor, by all Scriptural means, to have those evils remedied. Who will say that it is not? And does it not peculiarly belong to you, who occupy the place of Gospel ministers, to be leaders in this laudable undertaking? Much depends upon your hearty concurrence and zealous endeavors.
I found it interesting the problems he identifies as sourced in division. For example, divided churches cannot practice discipline.