The interpretation timeline
Galatians 2:8 Douay-Rheims

(For he who wrought in Peter to the apostleship of the circumcision, wrought in me also among the Gentiles.)

A.D. 202 – 1871 7 witnesses

Patristic

before A.D. 750
202
A.D.
Irenaeus Patristic
c. A.D. 130–202
“With regard to those (the Marcionites) who allege that Paul alone knew the truth, and that to him the mystery was manifested by revelation, let Paul himself convict them, when he says, that one and the same God wrought in Peter for the apostolate of the circumcision, and in himself for the Gentiles. Peter, therefore, was an apostle of that very God whose was also Paul; and Him whom Peter preached as God among those of the circumcision, and likewise the Son of God, did Paul [declare] also among the Gentiles. For our Lord never came to save Paul alone, nor is God so limited in means, that He should have but one apostle who knew the dispensation of His Son.”
Source
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“"For He that wrought for Peter unto the Apostleship of the Circumcision wrought for me also unto the Gentiles." He calls the Gentiles the Uncircumcision and the Jews the Circumcision, and declares his own rank to be equal to that of the Apostles; and, by comparing himself with their Leader not with the others, he shows that the dignity of each was the same. After he had established the proof of their unanimity, he takes courage, and proceeds confidently in his argument, not stopping at the Apostles, but advances to Christ Himself, and to the grace which He had conferred upon him, and calls the Apostles as his witnesses.”
Source

Scholastic

c. 1100 – 1500
1273
A.D.
Thomas Aquinas Catholic
1225–1274
“Having shown that the Apostle in no way withdrew from his position in the aforesaid conference, he here consequently shows that nothing was added to his teaching by the other apostles. And concerning this he does two things. First, he describes the condition of the apostles, who were unable to add anything to him; second, he pursues his proposal, at the place for to me, they who, etc. Now he describes their condition from three things. First, from the authority which they had in the Church, which is great. And as to this he says but from these, etc. The text is defective, whence it ought to be supplied thus: but from these, namely from Peter and John; as if he were saying: although for a time I yielded to them, I nevertheless received nothing from them, either of power or of doctrine. And if I received nothing from these, much less from the others. But it should be noted that what he says, who seemed to be something, if this is understood according to the grace of God which was in them, is true in this way, that according to this they were great, because whom he justified, these he also magnified, as is said in Romans 8:30. But if they are understood to be something according to themselves, then it is false, because according to this they were nothing. For if they seemed to be something of themselves, they would always have been great, because what belongs to a thing through itself always belongs to it. Whence, since they were not always great, they did not seem to be something of themselves. Second, he describes their condition from their state before their conversion, which they had in the synagogue. And this state he cautiously shows to have been abject and vile. Whence he says whatsoever they once were, because they were rustic, poor, unlearned, and without letters. 1 Corinthians 1:26: not many wise according to the flesh, etc. But what they were, it is nothing, that is, it does not matter to me, namely, to speak of it. And this perhaps he introduces so that, considering the state which they had in the synagogue (which was nothing) and the state of Paul (which was great), they might clearly know that Paul, as regards the matters of the Law, is to be preferred to them, and especially since Paul, in the state of the Church of Christ, was equal to them, so that Paul, in the state of the synagogue before his conversion, surpassed them, while in the state after his conversion he was equal to them. Whence, when it was a question of the synagogue, one ought rather to stand by Paul's judgment than that of the others; but when it was a question of the Gospel, one ought to stand by his judgment just as by that of the others. And just as the others were not great through the matters of the Law, but through Christ, so too the Apostle was great through Christ in faith, and not through the matters of the Law. Third, he describes their condition from divine election, and as to this he says for God does not accept the person, etc., as if he were saying: therefore they are great, because God magnified them, not looking to their merits or demerits, but to that very thing which he intends to do. And therefore he says God does not accept the person of man, that is, he does not regard it as great or small. Wisdom 6:8: he made the small and the great, etc. But without acceptance of persons he calls all to salvation, not imputing to them their sins, and this because they have passed away. 2 Corinthians 5:17: the old things have passed away, etc. Psalm 15:4: nor will I be mindful of their names, etc. And therefore Peter says, in Acts 10:34: in truth I have found that there is no acceptance of persons, etc. Concerning this it should be known that to accept a person is properly to attend, in some transaction, to a condition of the person that contributes nothing to the transaction, as if it were the rule of that transaction itself — for example, when I give a benefit to someone because he is noble, or handsome. For nobility or handsomeness contributes nothing to his having the benefit. But if the condition of the person does contribute to the transaction, then, in considering that condition in that deed, I am not accepting the person; as when I give a benefit to someone because he is good, and will serve the Church well, because he is well-lettered and honest, I am not an accepter of persons. Therefore to accept a person, properly speaking, is nothing other than to consider a condition of the person which contributes nothing to the transaction. Since, then, God in his works and benefits regards nothing pre-existing on the part of the creature — because that very thing which belongs to the creature is the effect of his election — but regards only, as a rule, the good pleasure of his own will, according to which he works all things, and not according to any condition of the person, as is said in Ephesians 4:7, it is manifest that he does not accept the person of man. Consequently, having described their condition, he shows his proposal, namely that they were able to add nothing to him. And therefore he says for to me, they who seemed to be something, contributed nothing, as if he were saying: although they were of great authority, nevertheless they added nothing to my teaching nor to my power, because, as was said above, neither did I receive the Gospel from man, nor was I taught it through man. But the Gloss reads otherwise: whatsoever they once were, etc., as if he were saying: it does not pertain to me to recount their state before their conversion, namely what sort of men they were, because this too does not matter, since I too was a persecutor of that very Church, and yet God, by the good pleasure of his own will, chose me and magnified me, and this because the Lord does not accept the person of man. Consequently, when he says but on the contrary, when they had seen, etc., he shows how his position was approved by the apostles. And concerning this he does three things. First, he sets down the cause of the approval; second, he intimates the approval itself, at the place James and Cephas, etc. Third, he adds a certain condition attached to the approval, at the place only that we should be mindful of the poor, etc. Now he sets down a twofold cause of the approval (which moved the apostles to approve the Apostle's position), namely, the office of preaching enjoined upon the Apostle by Christ, and the effect of the office enjoined, at the place and when they had known, etc. Concerning the first, he first sets down the office enjoined, which moved them to approve; second, the manifestation of the office, at the place for he who wrought, etc. He says therefore: I say that they who seemed to be something contributed nothing to me, but rather, against the opinion of the adversaries, who had gone up against me to Jerusalem to the apostles on account of this very question, the apostles themselves approved me, and this when they had seen that the Gospel had been entrusted to me, that is, the office of preaching, of the uncircumcision, that is, enjoined to preach to the uncircumcised, namely, to the gentiles. Jeremiah 9:26: all the nations have the foreskin, but the whole house, etc. Just as authority was committed to Peter, that he should preach to the Jews only, and to Paul, to the gentiles; but afterward both Peter preached to the gentiles, and Paul to the Jews. But because someone could say: whence is it clear to us that the Gospel among the gentiles has been committed to you? Therefore, interposing, he says that it is through the operations of Christ. For just as it is evident that Peter received the Gospel from Christ on account of the wonders which Christ worked through him, so it is evident that I received it from him on account of the miracles which Christ has wrought, and works, in me. And therefore he says he who wrought in Peter, etc., that is, he who made Peter an apostle in Judea, namely Christ, he himself made me an apostle among the gentiles. And this is the cause which moves them. But because the injunction and authority of preaching does not suffice, unless a man carries it out through good knowledge and discreet eloquence, and commends it through a good life, therefore he adds the use of his authority or office, that is, its effect, saying and when they had known the grace of God, etc. And this is a suspended clause, that is, when they had seen that my preaching was gracious and fruitful, then James, and Cephas, and John, etc. In which is noted the approval, or the fellowship made between them and Paul. And first the persons are set down between whom the fellowship was made, who are James, and Cephas, that is, Peter, and John. And James is placed first, because he was bishop of Jerusalem, where these things were done. Now this John was John the Evangelist, who did not leave Judea until the time of Vespasian. Who seemed to be pillars. This is said metaphorically, that is, the support of the whole Church. For just as a whole building is sustained by pillars, so through these men the whole Church of the Jews was sustained and ruled. And of these pillars it is said in Psalm 74:4: I have made firm its pillars, that is, the apostles of the Church; Song of Songs 5:15: his legs are pillars of marble, which are founded upon bases of gold. These, namely on the one side, gave the right hands of fellowship, that is, they consented into fellowship, to me and to Barnabas, in which are designated the persons on the other side. Now by this, that they gave right hands to each other, it is signified that by their hands they received one another as a sign of conjunction and of unity of opinion. Second, the tenor or condition of the fellowship is shown, when it is said that we should go to the gentiles, and they to the circumcision, namely, that they should preach; as if he were saying: a conjunction and union was made between us, yet in such a way that, just as all the faithful obey Peter in the circumcision, that is, in the Church of the faithful Jews, so all the gentiles who were converted to Christ should obey Barnabas and Paul. This, however, was added, that we should be mindful of the poor of Christ, who, namely, had sold all their goods, and had placed the price of them at the feet of the apostles, having been made poor on account of Christ. Which indeed I was solicitous to do this same thing, no less zealous than those who had ordained it, as appears in Romans 15, and 1 Corinthians 6, and 2 Corinthians chapters 8 and 9. Now the reason why the custom of the primitive Church, of the selling of possessions, was observed in the Church from the circumcision, and not in the Church from the gentiles, is this: because the faithful Jews were gathered together in Jerusalem, and in Judea, which was soon to be destroyed by the Romans, as the outcome of the matter afterward proved; and therefore the Lord willed that possessions should not be kept in reserve there, where they were not going to remain. But the Church of the gentiles was to be established and increased, and therefore it was brought about by the counsel of the Holy Spirit, that in it possessions should not be sold.”

Reformation

c. 1500 – 1650
1637
A.D.
1567–1637
“He that wrought effectually in Peter to the apostleship of the circumcision — to make him the Apostle of the circumcised Jews by filling Peter with strength and effectual energy, did exactly the same for me among the Gentiles. As Ephrem puts it, he was alike effectual in us, both by working signs and wonders, by efficacy of speech, by the conversion of some — many — to Christ”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“For he that wrought effectually in Peter,.... The Syriac version renders it, "he who exhorted Peter to"; the Arabic version is, "he who strengthened Peter in"; the Spirit of God is meant, who filled Peter with such eminent gifts, and inspired him with so much zeal and resolution to the apostleship of circumcision, to discharge his office as an apostle among the Jews; and who wrought by him such wonderful works for the confirmation of it, as curing the man that was lame from his birth, striking Ananias and Sapphira dead for telling lies, and raising Dorcas from the dead, and communicating miraculous gifts by the imposition of his hands; and which same Spirit also made his ministrations effectual to the conversion of a large number of souls, as of three thousand by one sermon. The same was mighty in me towards the Gentiles. The Spirit of God wrought as effectually in, and by him, as in Peter; filled him with extraordinary gifts for the discharge of his work among the Gentiles, and inspired him with equal zeal, constancy, and intrepidity of mind; wrought as many miracles by him to confirm his mission; such as striking blind Elymas the sorcerer, healing the cripple at Lystra, raising Eutychus from the dead, with many other signs and wonders wrought by him among the Gentiles, through the power of the Spirit of God, whereby they became obedient by word and deed. The same Spirit also accompanied the Gospel preached by him, to the conversion of multitudes, by which means many famous churches were founded and raised among the Gentiles; and this is another reason which induced the apostles at Jerusalem to take Paul and Barnabas into an association with them.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“For he that wrought effectually - Ὁ ενεργησας Πετρῳ, ενηργησε και εμοι· He who wrought powerfully with Peter, wrought powerfully also with me. He gave us both those talents which were suited to our work, and equal success in our different departments.”
1871
A.D.
1871
“he--God (Co1 12:6). wrought effectually--that is, made the preached word efficacious to conversion, not only by sensible miracles, but by the secret mighty power of the Holy Ghost. in Peter--ELLICOTT and others, translate, "For Peter." GROTIUS translates as English Version. to--with a view to. was mighty--Translate as before, the Greek being the same, "wrought effectually." in me--"for (or 'in') me also."”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.