Summa Theologiae · I, q. 36
Question 36. Of the Person of the Holy Ghost
Thomas Aquinas, Summa Theologiae, First Part. 4 articles.
Text: Summa Theologiae, Project Gutenberg #17611, First Part (Prima Pars), translated by the Fathers of the English Dominican Province. The First 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. Rights: Public domain (US)
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We proceed to treat of what belongs to the person of the Holy Ghost, Who is called not only the Holy Ghost, but also the Love and Gift of God. Concerning the name "Holy Ghost" there are four points of inquiry:
(1) Whether this name, "Holy Ghost," is the proper name of one divine Person?
(2) Whether that divine person Who is called the Holy Ghost, proceeds from the Father and the Son?
(3) Whether He proceeds from the Father through the Son?
(4) Whether the Father and the Son are one principle of the Holy Ghost?