The City of God stands as Augustine's masterwork of theological defense and construction, written over thirteen years in response to accusations that Christianity brought ruin upon Rome. This first volume contains the first ten books of sustained refutation—demolishing pagan claims that traditional worship secured either temporal prosperity or eternal happiness—followed by the beginning of his positive vision in Books Eleven through Thirteen, where he traces the origin of two societal orders to the primordial division among the angels. What emerges is not merely an apology for Christianity but a philosophy of history that subordinate the fate of empires to the hidden providence of the one true God, whose sovereignty extends from creation through the fall to the final judgment.
This brings Augustine to the climax of his argument regarding the universal way of salvation. Porphyry confessed, near the end of his work on the soul’s return, that no system of doctrine offering a universal way of deliverance had yet been received—from the truest philosophy, from the wisdom of the Indians, from the reasoning of the Chaldaeans, or from any other source. He acknowledged that such a way must exist, for Divine Providence would not leave humanity destitute of the means of salvation, yet he lamented that it had not come to his knowledge. Augustine identifies this universal way: it is the grace of God in Jesus Christ, proclaimed to all nations, purifying the whole human person in preparation for immortality. This way was promised to Abraham when God declared that in his seed all nations would be blessed. It was foretold by the prophets, who announced that the mountain of the Lord’s house would be established and all nations would flow to it. Christ Himself declared that He is the way, the truth, and the life. This way does not belong to one nation exclusively but is offered universally to all peoples.
Porphyry’s blindness to the Incarnation is traced to his pride. He could not accept the incarnation because it seemed too humble, too lowly, too unworthy of divine dignity. Yet the very features he despised—the virgin birth, the suffering, the death, the resurrection of the body—are the means by which God has accomplished what philosophy could never achieve: the purification and redemption of the whole human person, body and soul together. The Mediator assumed the entirety of human nature in order to heal it entirely. No other way of deliverance has ever been available, none is available now, and none ever will be. The souls of the righteous from every age—those who lived before the law, those under the law, and those who have received the gospel—have been and are being saved through this one Mediator, this one sacrifice, this one universal way.
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