If Rome is queen of the cities of the world, why should not its pastor be the king of bishops? Why should not the Roman Church be the mother of Christendom? Why should not the nations be her children, and her authority their sovereign law? It was easy for the ambitious heart of man to reason in this way. Ambitious Rome did so.

Thus Pagan Rome, when she fell, sent the proud titles which her invincible sword had conquered from the nations of the earth to the humble minister of the God of peace seated amidst her ruins.

The bishops in the different quarters of the empire, led away by the charm which Rome had for ages exercised over all nations, followed the example of the Campagna di Roma, and lent a hand to this work of usurpation. They took pleasure in paying to the Bishop of Rome somewhat of the honour which belonged to the Queen city of the world. At first there was no dependence implied in this honour. They treated the Roman pastor as equal does equal;[8] but usurped powers grow like avalanches. What was at first mere brotherly advice soon became, in the mouth of the Pontiff, obligatory command. In his eyes a first place among equals was a throne.

The Western bishops favoured the designs of the pastors of Rome, either from jealousy of the Eastern bishops or because they preferred the supremacy of a pope to the domination of a temporal power.

On the other hand, the theological factions which rent the East sought, each in its turn, to gain the favour of Rome, anticipating their triumph from the support of the principal Church of the West.

Rome carefully registered these requests, these mediations, and smiled when she saw the nations throwing themselves into her arms. She let slip no occasion of increasing and extending her power. Praise, flattery, extravagant compliments, consultation by other churches, all became, in her eyes, and in her hands, titles and evidents of her authority. Such is man upon the throne; incense intoxicates him, and his head turns. What he has he regards as a motive to strive for more.

The doctrine of the Church, and of the necessity of her external unity, which began to prevail so early as the third century, favoured the pretensions of Rome. The primary idea of the Church is, that it is the assembly of the saints, (1 Cor., i, 2,) the assembly of the first-born whose names are written in heaven. (Heb., xii, 23.) Still, however, the Church of the Lord is not merely internal and invisible. It must manifest itself outwardly, and it was with a view to this manifestation that the Lord instituted the Sacraments of Baptism and the Eucharist. The Church considered as external, has characteristics different from those which distinguish her as the Church invisible. The internal Church, which is the body of Christ, is necessarily and perpetually one. The visible Church, doubtless, has part in this unity, but considered in herself, multiplicity is a characteristic attributed to her in the Scriptures of the New Testament. While they speak to us of a Church of God,[9] they mention, when speaking of the Church, as externally manifested, "the Churches of Galatia," "the Churches of Macedonia," "the Churches of Judea," "all the Churches of the Saints."[10] These different Churches, unquestionably, may to a certain extent cultivate external union; but though this tie be wanting, they lose none of the essential qualities of the Church of Christ. In primitive times, the great tie which united the members of the Church was the living faith of the heart, by which all held of Christ as their common Head.

Various circumstances early contributed to originate and develop the idea of the necessity of an external unity. Men accustomed to the ties and political forms of an earthly country, transferred some of their views and customs to the spiritual and eternal kingdom of Jesus Christ. Persecution, powerless to destroy, or even to shake this new society, drew its attention more upon itself, and caused it to assume the form of a more compact incorporation. To the error which sprung up in deistical schools, or among sects, was opposed the one universal truth received from the Apostles, and preserved in the Church. This was well, so long as the invisible and spiritual Church was one with the visible and external Church. But a serious divorce soon took place; the form and the life separated from each other. The semblance of an identical and external organisation was gradually substituted for the internal and spiritual unity which forms the essence of genuine religion. The precious perfume of faith was left out, and then men prostrated themselves before the empty vase which had contained it. The faith of the heart no longer uniting the members of the Church, another tie was sought, and they were united by means of bishops, archbishops, popes, mitres, ceremonies, and canons. The living Church having gradually retired into the hidden sanctuary of some solitary souls, the external Church was put in its place, and declared to be, with all its forms, of divine institution. Salvation, no longer welling up from the henceforth hidden Word, it was maintained that it was transmitted by means of the forms which had been devised, and that no man could possess it if he did not receive it through this channel. None, it was said, can, by his own faith, attain to eternal life. Christ communicated to the Apostles, and the Apostles communicated to the Bishops, the unction of the Holy Spirit; and this Spirit exists nowhere but in that order! Originally, whosoever had the Spirit of Jesus Christ was a member of the Church, but the terms were now reversed, and it was maintained that none but members of the Church received the Spirit of Jesus Christ.[11]

In proportion as these ideas gained ground, the distinction between clergy and people became more marked. The salvation of souls no longer depended solely on faith in Christ, but also, and more especially, on union with the Church. The representatives and heads of the Church obtained a part of the confidence due only to Jesus Christ, and in fact became mediators for the flock. The idea of the universal priesthood of Christians accordingly disappeared step by step; the servants of the Church of Christ were likened to the priests under the Old Dispensation; and those who separated from the bishop were put in the same class with Korah, Dathan, and Abiram. From an individual priesthood, such as was then formed in the Church, to a sovereign priesthood, such as Rome now claims, the step was easy.

In fact, as soon as the error as to the necessity of a visible unity of the Church was established, a new error was seen to arise, viz., that of the necessity of an external representative of this unity.