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.
Objection 1: It seems that, outside a case of necessity, no one but a priest may hear the confession of venial sins. For the dispensation of a sacrament is committed to a layman by reason of necessity. But the confession of venial sins is not necessary. Therefore it is not committed to a layman.
Obj. 2: Further, Extreme Unction is ordained against venial sin, just as Penance is. But the former may not be given by a layman, as appears from James v. 14. Therefore neither can the confession of venial sins be made to a layman.
On the contrary, is the authority of Bede (on James v. 16, Confess... one to another) quoted in the text (iv. Sent D. 17).
I answer that, By venial sin man is separated neither from God nor from the sacraments of the Church: wherefore he does not need to receive any further grace for the forgiveness of such a sin, nor does he need to be reconciled to the Church. Consequently a man does not need to confess his venial sins to a priest. And since confession made to a layman is a sacramental, although it is not a perfect sacrament, and since it proceeds from charity, it has a natural aptitude to remit sins, just as the beating of one's breast, or the sprinkling of holy water (cf. P. IIl., Q. LXXXVIL,
A. 3); This suffices for the Reply to the First Objection, because there is no need to receive a sacrament for the forgiveness of venial sins; and a sacramental, such as holy water or the like, suffices for the purpose.
Reply Obj. 2: Extreme unction is not given directly as a remedy for venial sin, nor is any other sacrament.
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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.