In the middle of Book Four, Augustine finally leans in and tells us the gospel and it is just beautiful!
“He is within the inmost heart, yet the heart has wandered away from him. Return to your heart, O you transgressors, and hold fast to him who made you. Stand with him and you shall stand fast. Rest in him and you shall be at rest. Where do you go along these rugged paths? Where are you going? The good that you love is from him, and insofar as it is also for him, it is both good and pleasant. But it will rightly be turned to bitterness if whatever comes from him is not rightly loved and if he is deserted for the love of the creature. Why then will you wander farther and farther in these difficult and toilsome ways? There is no rest where you seek it. Seek what you seek; but remember that it is not where you seek it. You seek for a blessed life in the land of death. It is not there. For how can there be a blessed life where life itself is not?” But our very Life came down to earth and bore our death, and slew it with the very abundance of his own life. And, thundering, he called us to return to him into that secret place from which he came forth to us—coming first into the virginal womb, where the human creature, our mortal flesh, was joined to him that it might not be forever mortal—and came “as a bridegroom coming out his chamber, rejoicing as a strong man to run a race.” For he did not delay, but ran through the world, crying out by words, deeds, death, life, descent, ascension—crying aloud to us to return to him.”