The interpretation timeline
2 Thessalonians 2:13 Douay-Rheims

Whereunto also he hath called you by our gospel, unto the purchasing of the glory of our Lord Jesus Christ.

A.D. 397 – 1832 6 witnesses

Patristic

before A.D. 750
397
A.D.
Ambrose of Milan Patristic
A.D. 339–397
“And the apostle also teaches that the Holy Spirit sanctifies. For he speaks thus, "We are bound to give thanks to God always for you, brothers dearly beloved of the Lord; because God chose you as first fruits for salvation, in sanctification of the Spirit, and belief of the truth." So, then, the Father sanctifies, the Son also sanctifies, and the Holy Spirit sanctifies; but the sanctification is one, and the grace of the sacrament is one.”
Source
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“"But we are bound to give thanks alway to God for you, brethren beloved of the Lord, for that God chose you from the beginning unto salvation, in sanctification of the Spirit and belief of the truth." How unto salvation? By sanctifying you through the Spirit. For these are the things that are the efficient causes of our salvation. It is nowhere of works, nowhere of righteous deeds, but through belief of the truth. Here again, "in" is used for "through." "And through sanctification of the Spirit," he says.”
Source

Scholastic

c. 1100 – 1500
1272
A.D.
Thomas Aquinas Catholic
1225–1274
“After he has shown in whom the deception of Antichrist takes place, namely in those foreknown to damnation, here he assigns the cause of what has been said. And first he shows the cause of this, and how they will be deceived; second, how the faithful are freed from him, at the words but we. Again, first he sets down their fault alone; second, the punishment together with the fault; third, the punishment alone. And this is the process of sin: for first, on account of the demerit of the first sin, one is deserted by grace, and falls into another sin, and afterward is punished eternally. He says, therefore, that the cause why they will be deceived is that they were unwilling to receive the truth of charity, that is, the truth of the Gospel. John 8:46: if I tell the truth, why do you not believe me? Job 24:13: they were rebels against the light. And he says the charity of truth, because unless faith be formed by charity, it is nothing. 1 Cor 13:2: if I should have faith, so as to move mountains, but should not have charity, I am nothing, et cetera. Gal, last chapter: in Christ Jesus neither circumcision nor uncircumcision avails anything, but a new creature. And he adds the benefit of the truth, saying that they might be saved. Rom 5:1: being justified by faith, let us have peace with God through our Lord, et cetera. But their seduction is both fault and punishment; hence he says he will send, that is, he will permit to come upon them, the working of error. Is 19:14: the Lord has mingled in the midst of her a spirit of dizziness. 3 Kings, last chapter: I will be a lying spirit in the mouth of all his prophets. And therefore he says that they may believe the lie, that is, the false doctrine of Antichrist. Rom 2: for which reason God handed them over to a reprobate sense, that they might do those things which are not fitting. But the punishment alone is eternal damnation; hence he adds that they may be judged, namely by the judgment of damnation. John 5:29: and those who have done evil things shall come forth unto the resurrection of judgment, et cetera. All who have not believed the truth. John 3:18: he who does not believe is already judged. Then when he says but we, he shows why the faithful of Christ are freed. And first he gives thanks for them; second he calls to mind the divine benefits by which they are freed from such things. He says, therefore, thus: they will be deceived, but we ought to give thanks. Rom 1:8: first indeed I give thanks to my God always for you through our Lord, et cetera. Now he sets down a twofold benefit of God, namely the election of God, which is eternal, and the calling, which is temporal, at the words in which he also called you. He says, therefore, that (that is, because) he chose us, namely the apostles, and you, namely the faithful. Eph 1:4: he chose us in him before the foundation of the world, that we should be holy, et cetera. John 15:16: you have not chosen me, but I have chosen you. Concerning the election he touches on three things, namely the order of the elect, the end of the election, and the means of attaining the end. All the saints from the beginning of the world are elect. Deut 33:3: he loved the peoples, all the saints are in his hand. But the apostles are in a special way the firstfruits. Rom 8:23: we ourselves having the firstfruits of the spirit, et cetera. And therefore he says firstfruits of faith. Again, the end of the election is eternal salvation; and therefore he says unto salvation. 1 Tim 2:4: he wills all men to be saved, et cetera. Now this comes about, first, on God's part, through sanctifying grace; hence he says in sanctification of the spirit; second, on our part, there is the consent of free will through faith; therefore he adds and in the faith of truth. Then when he says in which he also called you, et cetera, he sets down the second benefit, which is the temporal calling of Christ, which follows upon the election. Rom 8:30: whom he called, these he also justified, et cetera. And concerning this calling, note the parable, Lk 14:16, of him who made a great supper, et cetera. And he adds through our Gospel, that is, preached by me. But to what supper? Unto the acquiring of glory, that is, that we may acquire the glory of Christ. Then when he says therefore, et cetera, he admonishes them to hold to the truth, and first he sets down the admonition; second the prayer, at the words but may the Lord himself, et cetera. And he does the first because our work depends on free will; but the second because it needs the help of grace. And first he admonishes them to stand, when he says stand in the truth. Gal 5:1: stand, and do not be held again by the yoke of servitude. Second, he teaches the manner of standing, at the words and hold the traditions, that is, the teachings which are handed down by our elders. For teachings which are handed down by lesser persons are sometimes not to be kept, namely when they are contrary to the teachings of the faith. Matt 15:6: you have made void the commandment of God on account of your tradition. But those things are to be kept which are ordered to the commandments of God. Which you have learned. Acts 16:4: Paul taught that they should hold the traditions and teachings which had been decreed by the apostles and elders who were at Jerusalem, et cetera. And they set forth these traditions in two ways: some by words, hence he says by word; some in writings, therefore he adds or by letter. Whence it is clear that many things in the Church, not written, were taught by the apostles, and therefore are to be kept. For many things, according to the judgment of the apostles, it was better that they be kept hidden, as Dionysius says. Hence the Apostle in 1 Cor 10 says the rest I will set in order when I come. Then he sets down the prayer, at the words but our Lord Jesus Christ himself, et cetera; as if to say: thus I admonish, but it avails nothing unless the divine help be present. And therefore he first sets down a twofold benefit of God. The first is his love toward us, by which he bestows other things upon us; therefore he says he has loved us. The second is spiritual consolation, at the words and gave eternal consolation. 2 Cor 1:4: who consoles us in all our tribulation. Is 40:1: be comforted, be comforted, my people, says the Lord your God, et cetera. And he says eternal consolation, namely against all evils imminent and to come. And therefore we await a good hope, that is, the infallibility of eternal goods. 1 Pet 1:3: who according to his great mercy has regenerated us unto a living hope. And this in grace, namely through which we hope to attain eternal life. Rom 6:23: the grace of God is eternal life. But he asks on their behalf for exhortation, which is an admonition leading the mind to willing. And this a man can do outwardly; but it would not be effective unless the spirit of God were within. Hence he says may he exhort your hearts, that is, may he incite them. Hos 2:14: I will lead her into solitude, and speak to her heart. Likewise he asks for confirmation, hence he says and confirm. Ps 67:29: confirm this, O God, which you have worked in us. As if to say: may he exhort through grace, that we may will, and confirm, that we may will effectively. And this in every good work and word. Work precedes word, because Jesus began to do and to teach, Acts 1:1.”

Post-Reformation

c. 1650 – 1900
1714
A.D.
Matthew Henry Reformed
1662–1714
“Here observe, I. The consolation the Thessalonians might take against the terrors of this apostasy, Th2 2:13, Th2 2:14. For they were chosen to salvation, and called to the obtaining of glory. Note, When we hear of the apostasy of many, it is matter of great comfort and joy that there is a remnant according to the election of grace which does and shall persevere; and especially we should rejoice if we have reason to hope that we are of that number. The apostle reckoned himself bound in duty to be thankful to God on this account: We are bound to give thanks to God always for you. He had often given thanks on their behalf, and he is still abounding in thanksgiving for them; and there was good reason, because they were beloved by the Lord, as appeared in this matter - their security from apostatizing. This preservation of the saints is owing, 1. To the stability of the election of grace, Th2 2:13. Therefore were they beloved of the Lord, because God had chosen them from the beginning. He had loved them with an everlasting love. Concerning this election of God we may observe, (1.) The eternal date of it - it is from the beginning; not the beginning of the gospel, but the beginning of the world, before the foundation of the world, Eph 1:4. Then, (2.) The end to which they were chosen - salvation, complete and eternal salvation from sin and misery, and the full fruition of all good. (3.) The means in order to obtaining this end - sanctification of the spirit and belief of the truth. The decree of election therefore connects the end and the means, and these must not be separated. We are not the elected of God because we were holy, but that we might be holy. Being chosen of God, we must not live as we list; but, if we are chosen to salvation as the end, we must be prepared for it by sanctification as the necessary means to obtain that end, which sanctification is by the operation of the Holy Spirit as the author and by faith on our part. There must be the belief of the truth, without which there can be by true sanctification, nor perseverance in grace, nor obtaining of salvation. Faith and holiness must be joined together, as well as holiness and happiness; therefore our Saviour prayed for Peter that his faith might not fail (Luk 22:32), and for his disciples (Joh 17:17), Sanctify them by thy truth; thy word is truth. 2. To the efficacy of the gospel call, Th2 2:14. As they were chosen to salvation, so they were called thereunto by the gospel. Whom he did predestinate those he also called, Rom 8:30. The outward call of God is by the gospel; and this is rendered effectual by the inward operation of the Spirit. Note, Wherever the gospel comes it calls and invites men to the obtaining of glory; it is a call to honour and happiness, even the glory of our Lord Jesus Christ, the glory he has purchased, and the glory he is possessed of, to be communicated unto those who believe in him and obey his gospel; such shall be with Christ, to behold his glory, and they shall be glorified with Christ and partake of his glory. Hereupon there follows, II. An exhortation to stedfastness and perseverance: Therefore, brethren, stand fast, Th2 2:15. Observe, He does not say, "You are chosen to salvation, and therefore you may be careless and secure;" but therefore stand fast. God's grace in our election and vocation is so far from superseding our diligent care and endeavour that it should quicken and engage us to the greatest resolution and diligence. So the apostle John having told those to whom he wrote that they had received the anointing which should abide in them, and that they should abide in him (in Christ), subjoins this exhortation, Now abide in him, Jo1 2:27, Jo1 2:28. The Thessalonians are exhorted to stedfastness in their Christian profession, to hold fast the traditions which they had been taught, or the doctrine of the gospel, which had been delivered by the apostle, by word or epistle. As yet the canon of scripture was not complete, and therefore some things were delivered by the apostles in their preaching, under the guidance of the infallible Spirit, which Christians were bound to observe as coming from God; other things were afterwards by them committed to writing, as the apostle had written a former epistle to these Thessalonians; and these epistles were written as the writers were moved by the Holy Ghost. Note, There is no argument hence for regarding oral traditions in our days, now that the canon of scripture is complete, as of equal authority with the sacred writings. Such doctrines and duties as were taught by the inspired apostles we must stedfastly adhere to; but we have no certain evidence of any thing delivered by them more than what we find contained in the holy scriptures.”
Source
1771
A.D.
John Gill Reformed
1697–1771
“But we are bound to give thanks alway to God for you,.... Lest the saints should be discouraged by the above account of antichrist, and his followers, and fear they should be left to the same deceptions, and damnation be their portion; the apostle being persuaded better things of them, gives their character, and represents their case in a quite different light; and signifies, that he and his fellow ministers were under obligation to be continually thankful to God for what he had done for them; for as God is the Father of mercies, whether spiritual or temporal, thanks are to be given to him; and saints are not only to bless his name for what they themselves receive from him, but for what others enjoy also, and that continually; because spiritual blessings, especially such as are afterwards instanced in, are permanent and durable, yea, everlasting: the characters which show them to be different from the followers of antichrist, are brethren, beloved of the Lord or "of God", as the Vulgate Latin and Ethiopic versions read: they were the brethren of Christ, being the dear children of God, born of him, and belonging to his family, and of the apostles, and of one another, being of the household of faith; and they were beloved by God the Father, as the instances of their election to salvation by him, and their calling to eternal glory, show; and by the Lord Jesus Christ, who had wrought out for them the salvation they were chosen to; and by the Lord the Spirit, by whom they were regenerated, called, sanctified, and brought to the belief of the truth; and since they had interest in the everlasting love of the three divine Persons, there was no danger of their falling away and perishing. The reason of the apostle's thanksgiving for the persons thus described is, because God hath from, the beginning chosen you to salvation; which is to be understood, not of an election of them, as a nation, for they were not a nation, only a part of one; nor of them as a church, for they were not so from the beginning; nor to the outward means of grace, the ministry of the word and ordinances, for the choice is unto salvation; nor to any office, for they were not all officers in the church, only some; nor does it intend the effectual calling, for that is distinguished from it in the following verse; but an eternal appointment of persons to grace and glory: and this is an act of God the Father, in Christ, from eternity; and which arises from his sovereign good will and pleasure, and is an instance of his free grace and favour, for the glorifying of himself; and is irrespective of the faith, holiness, and good works of men; all which are the fruits and effects, and not the motives, conditions, or causes of electing grace. This act is the leading one to all other blessings of grace, as justification, adoption, calling, and glorification, and is certain and immutable in itself, and in its effects. The date of it is "from the beginning": not from the beginning of the preaching of the Gospel to them, and the sense be, that, as soon as the Gospel was preached, they believed, and God chose them; for what was there remarkable in them, that this should be peculiarly observed of them? The Bereans are said to be more noble than they were: nor from the beginning of their calling, for predestination or election precedes calling; see Rom 8:30 nor from the beginning of time, or of the creation of the world, but before the world began, even from eternity; and in such sense the phrase is used in Pro 8:23 and that it is the sense of it here, is manifest from Eph 1:4 where this choice is said to be before the foundation of the world. The end to which men, by this act, are chosen, is "salvation": not temporal, though the elect of God are appointed to many temporal salvations and deliverances, and which they enjoy both before and after conversion; yet salvation here designs the salvation of the soul, though not exclusive of the body, a spiritual and an eternal salvation, salvation by Jesus Christ, as is expressed in Th1 5:9 and the same decree that appoints men to salvation, appoints Christ to be the Saviour of them; and there is salvation in and by no other. The means through which this choice is made, are through sanctification of the spirit, and belief of the truth by sanctification is meant, not anything external, as reformation of life, obedience to the law, or outward submission to Gospel ordinances; but internal holiness, which lies in a principle of spiritual life in the soul, and in a principle of spiritual light on the understanding; in a flexion of the will to the will of God, and the way of salvation by Christ; in a settlement of the affections on divine and spiritual things, and in an implantation of all grace in the heart; and is called the sanctification of "the spirit", partly from the spirit or soul of man being the principal seat of it, and chiefly from the Spirit of God being the author of it; and this being a means fixed in the decree of election to salvation, shows that holiness is not the cause of election, yet is certain by it, and is necessary to salvation; and that the doctrine of election is no licentious doctrine, since it provides for and secures true and real holiness. "Truth" designs either the Lord Jesus Christ, who is the truth of types and promises, and the substance of the truth of the Gospel, in whom it lies, and by whom it comes; or the Gospel itself, which comes from the God of truth, lies in the Scriptures of truth, is dictated and directed into by the spirit of truth; the sum of it is Christ the truth, and has nothing in it but truth. The "belief" or "faith" of this intends, not an historical faith, or a mere assent to truth; but a cordial embracing of it, a receiving of the love of the truth, a feeling of the power of it unto salvation, and a believing in Christ, the substance of it; which is a seeing of him spiritually, and a going out of the soul to him in acts of hope; reliance, trust, and dependence; and this being also a means settled in the choice of men to salvation, makes it appear, that faith is no cause of election, but the effect of it; that it is necessary to salvation, and therefore appointed as a means; that it is certain to the elect by it, and that they therefore cannot be finally and totally deceived, or be carried away with the error of the wicked, or with the deceivableness of unrighteousness with which antichrist works.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“God hath from the beginning chosen you to salvation, etc. - In your calling, God has shown the purpose that he had formed from the beginning, to call the Gentiles to the same privileges with the Jews, not through circumcision, and the observance of the Mosaic law, but by faith in Christ Jesus; but this simple way of salvation referred to the same end - holiness, without which no man, whether Jew or Gentile, can see the Lord. Let us observe the order of Divine grace in this business: 1. They were to hear the truth - the doctrines of the Gospel. 2. They were to believe this truth when they heard it preached. 3. They were to receive the Spirit of God in believing the truth. 4. That Spirit was to sanctify their souls-produce an inward holiness, which was to lead to all outward conformity to God. 5. All this constituted their salvation - their being fitted for the inheritance among the saints in light. 6. They were to obtain the glory of our Lord Jesus Christ - that state of felicity for which they were fitted, by being saved here from their sins, and by being sanctified by the Spirit of God.”
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.