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Summa Theologiae · III, q. 23, a. 3

Whether It Is Proper to the Rational Nature to Be Adopted?

Thomas Aquinas, Summa Theologiae, Third Part, question 23, Of Adoption as Befitting to Christ, article 3. 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 it is not proper to the rational nature to be adopted. For God is not said to be the Father of the rational creature, save by adoption. But God is called the Father even of the irrational creature, according to Job 38:28: "Who is father of the rain? Or who begot the drops of dew?" Therefore it is not proper to the rational creature to be adopted.

Obj. 2: Further, by reason of adoption some are called sons of God. But to be sons of God seems to be properly attributed by the Scriptures to the angels; according to Job 1:6: "On a certain day when the sons of God came to stand before the Lord." Therefore it is not proper to the rational creature to be adopted.

Obj. 3: Further, whatever is proper to a nature, belongs to all that have that nature: just as risibility belongs to all men. But to be adopted does not belong to every rational nature. Therefore it is not proper to human nature.

On the contrary, Adopted sons are the "heirs of God," as is stated Rom. 8:17. But such an inheritance belongs to none but the rational nature. Therefore it is proper to the rational nature to be adopted.

I answer that, As stated above (A. 2, ad 3), the sonship of adoption is a certain likeness of natural sonship. Now the Son of God proceeds naturally from the Father as the Intellectual Word, in oneness of nature with the Father. To this Word, therefore, something may be likened in three ways. First, on the part of the form but not on the part of its intelligibility: thus the form of a house already built is like the mental word of the builder in its specific form, but not in intelligibility, because the material form of a house is not intelligible, as it was in the mind of the builder. In this way every creature is like the Eternal Word; since it was made through the Word. Secondly, the creature is likened to the Word, not only as to its form, but also as to its intelligibility: thus the knowledge which is begotten in the disciple's mind is likened to the word in the mind of the master. In this way the rational creature, even in its nature, is likened to the Word of God. Thirdly, a creature is likened to the Eternal Word, as to the oneness of the Word with the Father, which is by reason of grace and charity: wherefore our Lord prays (John 17:21, 22): "That they may be one in Us . . . as We also are one." And this likeness perfects the adoption: for to those who are thus like Him the eternal inheritance is due. It is therefore clear that to be adopted belongs to the rational creature alone: not indeed to all, but only to those who have charity; which is "poured forth in our hearts by the Holy Ghost" (Rom. 5:5); for which reason (Rom. 8:15) the Holy Ghost is called "the Spirit of adoption of sons."

Reply Obj. 1: God is called the Father of the irrational creature, not properly speaking, by reason of adoption, but by reason of creation; according to the first-mentioned participation of likeness.

Reply Obj. 2: Angels are called sons of God by adoptive sonship, not that it belongs to them first; but because they were the first to receive the adoption of sons.

Reply Obj. 3: Adoption is a property resulting not from nature, but from grace, of which the rational nature is capable. Therefore it need not belong to every rational nature: but every rational creature must needs be capable of adoption.

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.