To speak of our Lord, the son of the Blessed Virgin Mary, as true and perfect man is of no value to us if we do not believe that he is descended from the line of ancestors set out in the Gospel. Matthew’s gospel begins by setting out the genealogy of Jesus Christ, son of David, son of Abraham, and then traces his human descent by bringing his ancestral line down to his mother’s husband, Joseph. On the other hand, Luke traces his parentage backward step by step to the actual father of mankind, to show that both the first and the last Adam share the same nature.