Augustine on Christ, writing to a student of his.

Begotten and conceived, then, without any indulgence of carnal lust, and therefore bringing with Him no original sin, and by the grace of God joined and united in a wonderful and unspeakablr way in one person with the Word, thr Only-begotten of the Father, a son by nature, not by grace, and therefore having no sin of His own; nevertheless, on account of the likeness of sinful flesh in which He came, He was called sin, that He might be sacrificed to wash away sin.

The heart of the Gospel message.

 Augustine speaks to a young friend, reminding him that Paul says we can only be saved by faith, and not by good deeds.  You see, Augustine says, we need a mediator in Jesus Christ, having given his precious blood for the sake of any in mankind that would only believe!