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Summa Theologiae · III, q. 4, a. 5

Whether the Son of God Ought to Have Assumed Human Nature in All Individuals?

Thomas Aquinas, Summa Theologiae, Third Part, question 4, Of the Mode of Union on the Part of the Human Nature, article 5. About 3 min.

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Text: Summa Theologiae, Project Gutenberg #19950, Third Part (Tertia Pars), translated by the Fathers of the English Dominican Province. The Third Part of the Summa in the English Dominican translation (first printed 1911 to 1925; second and revised edition from 1920). A sample check on 2026-11-09 against pre-1931 printings at the Internet Archive (first printings of 1915 and 1916 and the second and revised edition of the 1920s) found that the article text matches, with no 1947 introduction, synopsis, or index. The phrase “From the Complete American Edition” in Gutenberg's catalog title is a provenance note only. Question and article numbers were added by the transcriber. The Gutenberg text ends at question 90 of the Third Part, where Aquinas stopped writing; the Supplement is a separate edition here, transcribed from 1917 to 1922 printings of the same translation. Rights: Public domain (US)

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Objection 1: It would seem that the Son of God ought to have assumed human nature in all individuals. For what is assumed first and by itself is human nature. But what belongs essentially to a nature belongs to all who exist in the nature. Therefore it was fitting that human nature should be assumed by the Word of God in all its supposita.

Obj. 2: Further, the Divine Incarnation proceeded from Divine Love; hence it is written (John 3:16): "God so loved the world as to give His only-begotten Son." But love makes us give ourselves to our friends as much as we can, and it was possible for the Son of God to assume several human natures, as was said above (Q. 3, A. 7), and with equal reason all. Hence it was fitting for the Son of God to assume human nature in all its supposita.

Obj. 3: Further, a skilful workman completes his work in the shortest manner possible. But it would have been a shorter way if all men had been assumed to the natural sonship than for one natural Son to lead many to the adoption of sons, as is written Gal. 4:5 (cf. Heb. 2:10). Therefore human nature ought to have been assumed by God in all its supposita.

On the contrary, Damascene says (De Fide Orth. iii, 11) that the Son of God "did not assume human nature as a species, nor did He assume all its hypostases."

I answer that, It was unfitting for human nature to be assumed by the Word in all its supposita. First, because the multitude of supposita of human nature, which are natural to it, would have been taken away. For since we must not see any other suppositum in the assumed nature, except the Person assuming, as was said above (A. 3), if there was no human nature except what was assumed, it would follow that there was but one suppositum of human nature, which is the Person assuming. Secondly, because this would have been derogatory to the dignity of the incarnate Son of God, as He is the First-born of many brethren, according to the human nature, even as He is the First-born of all creatures according to the Divine, for then all men would be of equal dignity. Thirdly, because it is fitting that as one Divine suppositum is incarnate, so He should assume one human nature, so that on both sides unity might be found.

Reply Obj. 1: To be assumed belongs to the human nature of itself, because it does not belong to it by reason of a person, as it belongs to the Divine Nature to assume by reason of the Person; not, however, that it belongs to it of itself as if belonging to its essential principles, or as its natural property in which manner it would belong to all its supposita.

Reply Obj. 2: The love of God to men is shown not merely in the assumption of human nature, but especially in what He suffered in human nature for other men, according to Rom. 5:8: "But God commendeth His charity towards us; because when as yet we were sinners . . . Christ died for us," which would not have taken place had He assumed human nature in all its supposita.

Reply Obj. 3: In order to shorten the way, which every skilful workman does, what can be done by one must not be done by many. Hence it was most fitting that by one man all the rest should be saved.

Also online, linked only: the same translation at New Advent and the Latin text at Corpus Thomisticum. Neither is copied here.

Source: Thomas Aquinas. Summa Theologica, Third Part. Project Gutenberg #19950. Project Gutenberg record. Public domain in the USA. Outside the U.S., check local copyright rules. Project Gutenberg notices retained. The full Project Gutenberg license is kept in the hosted text.