This and other titles, with the names of those that wrote the Gospels, are not the words of the Evangelists themselves. The Scripture itself nowhere teacheth us, which books or writings are to be received as true and canonical Scriptures. It is only by the channel of unwritten traditions, and by the testimony and authority of the Catholic Church, that we know and believe that this gospel, for example of S. Matthew, with all contained in it, and that the other books and parts of the Old or New Testament, are of divine authority, or written by divine inspiration; which made S. Augustine say, I should not believe the gospel, were I not moved thereunto by the authority of the Catholic Church: Ego evangelio non crederem, nisi me Ecclesiæ Catholicæ commoveret auctoritas. Lib. con. Epist. Manichæi, quam vocant fundamenti. tom. viii. c. 5, p. 154. A. Ed. Ben. Wi.