8 Now upon this thus faithfully narrated, the first cavil they bring is, that the same Matthew goes on to say, “All the generations from Abraham to David are fourteen generations; and from David until the carrying away into Babylon are fourteen generations; and from the carrying away into Babylon unto Christ are fourteen generations.” Then in order to tell us how Christ was born of the Virgin Mary, he went on and said, “Now the birth of Jesus Christ was on this wise;” for by the line of the generations he had showed why Christ is called the Son of David, and the Son of Abraham.
But now it needed to be shown how He was born and appeared among men: and so there follows immediately that narrative, by means of which we believe that our Lord Jesus Christ was not only born of the everlasting God, coeternal with Him who begot Him before all times, before all creation, by whom all things were made; but was also now born from the Holy Ghost, of the Virgin Mary, which we confess equally with the other; for you remember and know (for I am speaking to Catholics, to my brethren), that this is our faith, that this we profess and confess; for this faith thousands of martyrs have been slain in all the world.
Source: Sermons on Selected Lessons of the New Testament (New Advent)