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 even a bishop cannot grant indulgences. Because the treasury of the Church is the common property of the whole Church. Now the common property of the whole Church cannot be distributed save by him who presides over the whole Church. Therefore the Pope alone can grant indulgences.
Obj. 2: Further, None can remit punishments fixed by law, save the one who has the power to make the law. Now punishments in satisfaction for sins are fixed by law. Therefore the Pope alone can remit these punishments, since he is the maker of the law.
On the contrary stands the custom of the Church in accordance with which bishops grant indulgences.
I answer that, The Pope has the plenitude of pontifical in. 4 21 power, being like a king in his kingdom: whereas the bishops are appointed to a share in his solicitude, like judges over each city. Hence them alone the Pope, in his letters, addresses as brethren, whereas he calls all others his sons. Therefore the plenitude of the power of granting indulgences resides in the Pope, because he can grant them, as he lists, provided the cause be a lawful one: while, in bishops, this power resides subject to the Pope's ordination, so that they can grant them within fixed limits and not beyond.
This suffices for the Replies to the Objections.
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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.