Augustine taught the people primarily through his sermons and doctrinal treatises.
He as an able orator. "The orator must formulate his speech in such a way as to instruct the audience, hold their attention, and to win. By this, Augustine meant that the orator must not only instructed the audience in what is true, he must also convince them of the truth so that they will act on it."
In one of his sermons Augustine discusses why Christ was born of a woman and not without woman. He says. "If ... He had not been born of a woman, women might have despaired of themselves, as mindful of their first sin, because by a woman was the first man deceived, and would have thought that they had no hope at all in Christ."
In another of his sermons, Augustine discusses the fact that the Father does nothing without the Son. If this is the case, some were saying, that the Father was also born of Mary along with the Son. Augustine quotes St. Paul who wrote, "But, when the fullness of time had come, God sent his Son, born of a woman, born under the Law, to ransom those under the law." (Gal4:4) This shows Christ made man was the work of the Father. Likewise, the incarnation was the work of the Son as stated in scripture, "Who, though he was in the form of God, did not regard equality with God, something to be grasped. Rather, he emptied himself, taking the form of a slave. (Phil. 2:6-7)
Augustine also warned his hearers to be humble because human nature is limited in understanding the mystery of the Trinity. He says, "Let words be hushed: let the tongue be silent, let the heart be aroused, let the heart be lifted up thither. For it is not of such a nature as that it can ascend into the heart of man; but the heart of man must itself ascend to it."
click image for beautiful story of Augustine and Trinity
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