Bede the Venerable — as excerpted in the Catena Aurea on Mark 1:1

“(in Marc. i. 1) The beginning of this Gospel should be compared with that of Matthew, in which it is said, The book of the generation of Jesus Christ, the Son of David, the Son of Abraham. But here He is called the Son of God. Now from both we must understand one Lord Jesus Christ, Son of God, and of man. And fitly the first Evangelist names Him Son of man, the second, Son of God, that from less things our sense may by degrees mount up to greater, and by faith and the sacraments of the human nature assumed, rise to the acknowledgment of His divine eternity. Fitly also did He, who was about to describe His human generation, begin with a son of man, namely, David or Abraham. Fitly again, he who was beginning his book with the first preaching of the Gospel, chose rather to call Jesus Christ, the Son of God; for it belonged to the human nature to take upon Him the reality of our flesh, of the race of the patriarchs, and it was the work of Divine power to preach the Gospel to the world.”