In the second tract he advocated a principle which had a prodigious influence on the minds of his generation, and greatly contributed to establish the polity of the Roman Catholic Church. He argued the necessity of unity in government as well as unity in faith, like Cyprian before him; and this has endeared him to the Roman Catholic Church, I apprehend, even more than his glorious defence of the Pauline theology. There are some who think that all governments arise out of the circumstances and the necessities of the times, and that there are no rules laid down in the Bible for any particular form or polity, since a government which may be adapted to one age or people may not be fitted for another;--even as a monarchy would not succeed in New England any more than a democracy in China. But the most powerful sects among Protestants, as well as among the Catholics themselves, insist on the divine authority for their several forms of government, and all would have insisted, at different periods, on producing conformity with their notions. The high-church Episcopalian and the high-church Presbyterian equally insist on the divine authority for their respective institutions. The Catholics simply do the same, when they make Saint Peter the rock on which the supremacy of their Church is based. In the time of Augustine there was only one form of the visible Church,--there were no Protestants; and he naturally wished, like any bishop, to strengthen and establish its unity,--a government of bishops, of which the bishop of Rome was the acknowledged head. But he did not anticipate--and I believe he would not have indorsed--their future encroachments and their ambitious schemes for enthralling the mind of the world, to say nothing of personal aggrandizement and the usurpation of temporal authority. And yet the central power they established on the banks of the Tiber was, with all its corruptions, fitted to conserve the interests of Christendom in rude ages of barbarism and ignorance; and possibly Augustine, with his profound intuitions, and in view of the approaching desolations of the Christian world, wished to give to the clergy and to their head all the moral power and prestige possible, to awe and control the barbaric chieftains, for in his day the Empire was crumbling to pieces, and the old civilization was being trampled under foot. If there was a man in the whole Empire capable of taking comprehensive views of the necessities of society, that man was the Bishop of Hippo; so that if we do not agree with his views of church government, let us bear in mind the age in which he lived, and its peculiar dangers and necessities. And let us also remember that his idea of the unity of the Church has a spiritual as well as a temporal meaning, and in that sublime and lofty sense can never be controverted so long as _One Lord, One Faith, One Baptism_ remain the common creed of Christians in all parts of the world. It was to preserve this unity that