Thomas Aquinas

“ But the seed of Abraham was derived from Adam. Therefore Christ's body was formed of matter derived from Adam.
I answer that, Christ assumed human nature in order to cleanse it of corruption. But human nature did not need to be cleansed save in as far as it was soiled in its tainted origin whereby it was descended from Adam. Therefore it was becoming that He should assume flesh of matter derived from Adam, that the nature itself might be healed by the assumption. ”

“ For this reason, through the medium of the Blessed Virgin, Christ is said to be of the seed of David, according to the flesh, by way of origin.
Reply to Objection 3: Christ and the human race are kindred, through the likeness of species. Now, specific likeness results not from remote but from proximate matter, and from the active principle which begets its like in species. Thus, then, the kinship of Christ and the human race is sufficiently preserved by His body being formed from the Virgin's blood, derived in its origin from Adam and the other patriarchs. ”

“ But now, He, the mediator between God and man, has so shown Himself, that, uniting both natures in the unity of one Person, He has given a dignity to ordinary by extraordinary things, and tempered the extraordinary by the ordinary. ”

“ Since the Blessed Virgin was of the same nature as other women, it follows that she had flesh and bones of the same nature as theirs. Now, flesh and bones in other women are actual parts of the body, the integrity of which results therefrom: and consequently they cannot be taken from the body without its being corrupted or diminished. ”

“ Consequently, since Abraham paid tithes to Melchisedech as to one greater than he, it follows that the priesthood of Melchisedech, inasmuch as he was a figure of Christ, was greater than that of Levi. But the priesthood of Christ does not result from carnal origin, but from spiritual grace. Therefore it is possible that a father pay tithes to a priest, as the less to the greater, and yet his son, if he be a bishop, is greater than that priest, not through carnal origin, but through the spiritual grace which he has received from Christ. ”

“ But to heal from sin belongs to Christ alone, for He is the "Lamb that taketh away the sin of the world" (Jn. 1:29) , whose figure was Melchisedech, as the Apostle proves (Heb. 7) . Therefore by giving tithes to Melchisedech, Abraham foreshadowed that he, as being conceived in sin, and all who were to be his descendants in contracting original sin, needed that healing which is through Christ. ”

“ With reason too he follows the origin of adoption; because by adoption we become children of God: whereas by carnal generation the Son of God became the Son of Man. Moreover he shows sufficiently that he does not say that Joseph was the son of Heli as though begotten by him, but because he was adopted by him, since he says that Adam was the son of God, inasmuch as he was created by God. ”

“ Now in Christ's genealogy Matthew mentions only three mothers---namely, Thamar, Ruth, and the wife of Urias. He also mentions the brothers of Judas and Jechonias, and also Phares and Zara. But Luke mentions none of these. Therefore the evangelists seem to have described the genealogy of Christ in an unsuitable manner.
On the contrary, The authority of Scripture suffices.
I answer that, As is written (2 Tim. 3:16) , "All Holy Scripture is inspired of God [Vulg.: 'All scripture inspired of God is profitable'] , etc. ”