From the Supplement, compiled after Aquinas’s death from his Commentary on the Sentences and transcribed here from the 1917 to 1922 printings. About the Supplement.
Text: Summa Theologiae, Supplement to the Third Part (Supplementum Tertiae Partis), transcribed from Internet Archive scans, translated by the Fathers of the English Dominican Province. The Supplement, compiled after Aquinas’s death from his earlier Commentary on the Sentences, in the same English Dominican translation as the Gutenberg Parts. Transcribed by Bibliotheca Catholica from the OCR of four Internet Archive scans of the pre-1931 printings (Questions 1 to 33 from the 1917 Washbourne and Benziger volume, 34 to 68 from the 1922 volume, 69 to 86 from the 1921 volume, and 87 to 99 from the 1922 Benziger volume), with OCR errors corrected and doubtful passages marked, not rewritten. 99 questions and 446 articles. The two appendices printed after Question 99 are not included. Sources, SHA-256 of each OCR file, and the method are in the source record. Rights: Public domain (US)
The Supplement is not a Project Gutenberg text. It is Bibliotheca Catholica’s transcription of public-domain scans at the Internet Archive; obvious OCR errors were corrected, and passages marked “OCR uncertain” could not be confidently corrected, so check them against the linked scan page.
One passage on this page is marked “OCR uncertain”; check it against the scan.
Objection 1: It seems that this sacrament should be conferred even on those who are in good health. For the healing of the mind is a more important effect of this sacrament than the healing of the body, as stated above (Q. XXX., A. 2). Now even those who are healthy in body need to be healed in mind. Therefore this sacrament should be conferred on them also.
Obj. 2: Further, This is the sacrament of those who are departing this life, just as Baptism is the sacrament of those who are entering this life. Now Baptism is given to all who enter. Therefore this sacrament should be given to all who are departing. But sometimes those who are near departure are in good health, for instance those who are to be beheaded. Therefore this sacrament should be conferred on them.
On the contrary, It is written (James v. 14): 7s any man sick among you etc. Therefore none but the sick are competent to receive this sacrament. [OCR uncertain: 7s. Check the scan, image 373.]
I answer that, This sacrament is a spiritual healing, as stated above (Q. XXX., AA. i, 2), and is signified by way of a healing of the body. Hence this sacrament should not be conferred on those who are not subjects for bodily healing, those, namely, who are in good health.
Reply Obj. 1: Although spiritual health is the principal effect of this sacrament, yet this same spiritual healing needs to be signified by a healing of the body, although bodily health may not actually ensue. Consequently spiritual health can be conferred by this sacrament on those alone who are competent to receive bodily healing, viz. the sick; even as he alone can receive Baptism who is capable of a bodily washing, and not a child yet in its mother's womb.
Reply Obj. 2: Even those who are entering into life cannot receive Baptism unless they are capable of a bodily washing. And so those who are departing this life cannot receive this sacrament, unless they be subjects for a bodily healing.
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Also online, linked only: the same translation at New Advent and the Latin text at Corpus Thomisticum. Neither is copied here.