The interpretation timeline
2 Peter 3:15 Douay-Rheims

And account the longsuffering of our Lord, salvation; as also our most dear brother Paul, according to the wisdom given him, hath written to you:

A.D. 155 – 1871 8 witnesses

Patristic

before A.D. 750
155
A.D.
Polycarp of Smyrna Patristic
c. A.D. 69–155
“These things, brethren, I write to you concerning righteousness, not because I take anything upon myself, but because ye have invited me to do so. For neither I, nor any other such one, can come up to the wisdom of the blessed and glorified Paul. He, when among you, accurately and stedfastly taught the word of truth in the presence of those who were then alive. And when absent from you, he wrote you a letter, which, if you carefully study, you will find to be the means of building you up in that faith which has been given you, and which, being followed by hope, and preceded by love towards God, and Christ, and our neighbour, "is the mother of us all." For if any one be inwardly possessed of these graces, he hath fulfilled the command of righteousness, since he that hath love is far from all sin.”
Source
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“Peter, in his second epistle, urged us to holiness in living and character, declaring that this world would pass. New heavens and a new earth are expected which will be given to the just to inhabit.… Some people had used certain obscure passages from Paul's writings in order to excuse their lack of concern to live well, on the ground that they were secure in their salvation. Peter was saying that some of the things which Paul said are hard to understand and that these people were twisting them to their own ruin.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And account that the longsuffering of our Lord,.... Not his longsuffering towards the wicked, and his forbearance with them, for that is not the means of, nor the way to, nor does it issue in, their salvation, but in their sorer punishment and greater damnation, see Rom 2:4; but towards the elect, as in Pe2 3:9; whom he bears much and long with before conversion, while in their sins, and in a state of unregeneracy, and waits to be gracious to them, as he is in their calling, and to make known and apply his great salvation to them; and as with particular persons, so with the whole body of them, till they are all gathered in, and even with the world for their sakes; and particularly the Lord's longsuffering here intends the deferring of his coming, or his seeming slackness in the performance of his promise: the reason of which is, salvation: the salvation of all his chosen ones, and in that it issues; he waits, he stays, that none of them might perish, but that they might be all brought to faith and repentance, and so be saved: wherefore the apostle would have the saints consider it in this light, and not imagine and conclude, with the scoffing infidels, that he is slack and dilatory, and will not come, but that his view in it is the salvation of all his people, which by this means is brought about: in confirmation of which, and other things he had delivered, he produces the testimony of the Apostle Paul; even as our beloved brother Paul also; he calls him a "brother", both on account of his being a believer in Christ, one that belonged to the same family with him, and was of the household of faith, born of the same Father, and related to the same Redeemer, the firstborn among many brethren, and likewise on account of his being a fellow apostle; for though he was not one of the twelve apostles, but his call and mission were later than theirs, yet Peter does not disdain to put him among them, and upon an equal foot with them, nor was he a whit behind the chief of them: he styles him a "beloved" brother; expressing his affection for him, which the relation between them called for, and which he bore to him, notwithstanding his public opposition to him, and sharp reproof of him, Gal 2:11, and perhaps loved him the more for it; see Psa 141:5; and he makes mention of him, and that under these characters, partly to show their agreement and consent in doctrine; and partly to recommend him to the Jews, to whom he writes, who had, upon report of his doctrine and ministry, entertained an ill, at least a mean opinion, of him; as also to set us an example to speak well of one another, both as ministers and private believers: according to the wisdom given unto him, hath written unto you; meaning not all his epistles, as being written for the general good of all the saints, as well as for those particular churches or men to whom they were sent; for what Peter speaks of is what was particularly written to them, and is distinguished in Pe2 3:16 from the rest of Paul's epistles; nor does he intend the epistle of Paul to the Romans, for the longsuffering of God spoken of in that, as in Rom 2:4, is his longsuffering to the wicked, which issues in their destruction, and not his longsuffering to his elect, which is salvation, as here; but he seems manifestly to have in view the epistle to the Hebrews, for Peter wrote both his first and second epistles to Jews; wherefore, since none of Paul's epistles but that were written particularly to them, it should seem that that is designed, and serves to confirm his being the author of it; in which he writes to the Hebrews concerning the coming of Christ, and of the deferring of it a little while, and of the need they had of patience to wait for it, Heb 10:36; and in it also are some things difficult to be understood concerning Melchizedek, the old and new covenant, the removing of the Aaronic priesthood, and the abrogation of the whole ceremonial law, &c. things not easily received by that nation; and the whole is written with great wisdom, respecting the person and office of Christ, the nature of his priesthood, and the glory of the Gospel dispensation; and in a most admirable manner is the whole Mosaic economy laid open and explained: he was indeed a wise master builder, and whatever he wrote was "according to wisdom"; not fleshly wisdom, the wisdom of this world, nor with enticing words of men's wisdom, but according to the divine wisdom, under the influence of the spirit of wisdom and revelation; for he had not this of himself naturally, nor did he learn it at Gamaliel's feet, but it was what was "given to him"; it came from above, from God, who gives it liberally; and as he himself always owned it to be a free grace gift of God bestowed on him, and that all his light and knowledge were by the revelation of Christ, so Peter ascribes it to the same, that God might have all the glory, and all boasting in man be stopped.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“And account that the long-suffering of our Lord - Conclude that God's long-suffering with the world is a proof that he designs men to be saved; even as our beloved brother Paul. "This epistle being written to those to whom the first epistle was sent, the persons to whom the Apostle Paul wrote concerning the long-suffering of God were the Jewish and Gentile Christians in Pontus, Galatia, Cappadocia, Asia, and Bithynia. Accordingly, we know he wrote to the Ephesians, (Eph 2:3-5), to the Colossians, (Col 1:21), and to Timothy, (Ti1 2:3, Ti1 2:4), things which imply that God's bearing with sinners is intended for their salvation. The persons to whom Peter's epistles were sent were, for the most part, Paul's converts." - Macknight. According to the wisdom given unto him - That is, according to the measure of the Divine inspiration, by which he was qualified for the Divine work, and by which he was so capable of entering into the deep things of God. It is worthy of remark that Paul's epistles are ranked among the Scriptures; a term applied to those writings which are divinely inspired, and to those only.”
Source
1849
A.D.
1774–1849
“As also our most dear brother, Paul,…hath written to you. He seems to mean in his epistle to the Hebrews or converted Jews, (Chap. x. 37.) where he says: yet a little while,…and he that is to come, will come, and will not delay. — In which are some things hard to understand, especially by unlearned, ignorant people, unstable, inconstant, not well grounded in faith, and which they wrest, [2] as they do also the other scriptures, by their private interpretations, to their own perdition. (Witham)”
Source
1863
A.D.
1871
A.D.
1871
“account . . . the long-suffering . . . is salvation--is designed for the salvation of those yet to be gathered into the Church: whereas those scoffers "count it (to be the result of) slackness" on the Lord's part (Pe2 3:9). our beloved brother Paul--a beautiful instance of love and humility. Peter praises the very Epistles which contain his condemnation. according to the wisdom given unto him--adopting Paul's own language, Co1 3:10, "According to the grace of God which is given unto me as a wise master-builder." Supernatural and inspired wisdom "GIVEN" him, not acquired in human schools of learning. hath written--Greek aorist, "wrote," as a thing wholly past: Paul was by this time either dead, or had ceased to minister to them. to you--Galatians, Ephesians, Colossians, the same region as Peter addresses. Compare "in peace," Pe2 3:14, a practical exhibition of which Peter now gives in showing how perfectly agreeing Paul (who wrote the Epistle to the Galatians) and he are, notwithstanding the event recorded (Gal 2:11-14). Col 3:4 refers to Christ's second coming. The Epistle to the Hebrews, too (addressed not only to the Palestinian, but also secondarily to the Hebrew Christians everywhere), may be referred to, as Peter primarily (though not exclusively) addresses in both Epistles the Hebrew Christians of the dispersion (see on Pe1 1:1). Heb 9:27-28; Heb 10:25, Heb 10:37, "speak of these things" (Pe2 3:16) which Peter has been handling, namely, the coming of the day of the Lord, delayed through His "long-suffering," yet near and sudden.”
Source

Undated

date unknown
date
unknown
Glossa Ordinaria Medieval
“Our brother. He says that Paul wrote to them, in which he shows, etc., up to and through these they may rouse themselves to advancement.”
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.