2 Augustine replied: You are always answering arguments which no one uses, instead of our real arguments, which you cannot answer. No one says that Christ could not die if He had not been born; for Adam died though he had not been born. What we say is, Christ was born, because this is said not by this or that heretic, but in the holy Gospel; and He died, for this too is written, not in some heretical production, but in the holy Gospel. You set aside argument on the question of the true account to be given of Jesus, and refer to what He says of Himself, and what His apostles say of Him; and yet, when I begin to quote the Gospel of His apostle Matthew, where we have the whole narrative of Christ's birth, you immediately deny that Matthew wrote the narrative, though this is affirmed by the continuous testimony of the whole Church, from the days of apostolic presidency to the bishops of our own time.
What authority will you quote against this? Perhaps some book of Manichæus, where it is denied that Jesus was born of a virgin. As, then, I believe your book to be the production of Manichæus, since it has been kept and handed down among the disciples of Manichæus, from the time when he lived to the present time, by a regular succession of your presidents, so I ask you to believe the book which I quote to have been written by Matthew, since it has been handed down from the days of Matthew in the Church, without any break in the connection between that time and the present.
The question then is, whether we are to believe the statements of an apostle who was in the company of Christ while He was on earth, or of a man away in Persia, born long after Christ. But perhaps you will quote some other book bearing the name of an apostle known to have been chosen by Christ; and you will find there that Christ was not born of Mary. Since, then, one of the books must be false, the question in this case is, whether we are to yield our belief to a book acknowledged and approved as handed down from the beginning in the Church founded by Christ Himself, and maintained through the apostles and their successors in an unbroken connection all over the world to the present day; or to a book which this Church condemns as unknown, and which, moreover, is brought forward by men who prove their veracity by praising Christ for falsehood.
Source: Reply to Faustus the Manichaean (New Advent)