The interpretation timeline
1 Thessalonians 2:12 Douay-Rheims

We testified to every one of you, that you would walk worthy of God, who hath called you unto his kingdom and glory.

A.D. 220 – 1871 7 witnesses

Patristic

before A.D. 750
220
A.D.
Tertullian Patristic
c. A.D. 150–220
“For it is our duty so to walk in the Lord's discipline as is "worthy," not according to the filthy concupiscences of the flesh.”
258
A.D.
Cyprian Patristic
c. A.D. 200–258
“For what could happen to me more desirable and more joyful than to be now close to you, that you might embrace me with those hands, which, pure and innocent, and maintaining the faith of the Lord, have rejected the profane obedience? What more pleasant and sublime than now to kiss your lips, which with a glorious voice have confessed the Lord, to be looked upon even in presence by your eyes, which, despising the world, have become worthy”
Source
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“"As ye know how we exhorted and comforted each one of you, as a father doth his own children." Above having spoken of his behavior here he speaks of his love, which was more than what belonged to his rule over them. And what is said marks his freedom from pride. "As a father his own children, exhorting you, and encouraging you, and testifying, to the end that ye should walk worthily of God, who calleth you into His own kingdom and glory." When he says, "and testifying," then he makes mention of "fathers"; although we testified, it was not violently, but like fathers. "Each one of you." Strange! in so great a multitude to omit no one, neither small nor great, neither rich nor poor. "Exhorting" you, he says; to bear. "And comforting and testifying." "Exhorting," therefore they did not seek glory; and "testifying," therefore they did not flatter. "That ye should walk worthily of God, who calleth you into His own kingdom and glory." Observe again, how, in relating, he both teaches and comforts. For if He hath called them unto His kingdom, if He called them unto glory, they ought to endure all things. We "entreat" you, not that you should grant us any favor, but that you should gain the kingdom of heaven.”
Source

Scholastic

c. 1100 – 1500
1272
A.D.
Thomas Aquinas Catholic
1225–1274
“Above he commended them because they received the word of God in tribulations; here he commends them because they did not withdraw from him on account of tribulations. And concerning this he does three things: first he recalls their tribulations; second he shows what remedy he applied for them, in chapter III, at the words "for which cause"; third, why, at the words "because now we live." But because he had said above, concerning them, that the apostle's entrance toward their conversion was reported by all, therefore he first treats of his own entrance; second, of their conversion, at "therefore we also give thanks." Concerning the first he does three things: first he recalls his own constancy, which he had before he came to them; second, the sincerity of the teaching by which he converted them, at "for our exhortation"; third, the sincerity of his conduct with those converted, at "for you." Again, the first is divided into two: first he sets forth the tribulations which he suffered before he came to them; second, how he did not lose confidence on this account, at "we had confidence." He says therefore: I say that he announces our entrance, which you also know, that it was not vain, etc., that is, light, but difficult, because it was through many tribulations. Or "not vain," that is, empty, but full. Gen. 1:2: the earth was void and empty, etc. Or "not vain," that is, unstable, but firm. Phil. 2:17: I have not run in vain, nor labored in vain. But we suffered bodily sufferings before. Prov. 19:11: the teaching of a man is known through patience. Ps. 91:15: they shall be well enduring, that they may proclaim. Likewise spiritual [sufferings], because on this account he was afflicted with insults in Philippi, where on account of the healing of the pythoness he suffered tribulations. And this city is of Macedonia. Nor yet on account of these things was the confidence of preaching extinguished. Is. 12:2: behold, God is my savior, I will act with confidence, and I will not fear. And this confidence was to preach to you the Gospel of God in much solicitude concerning your conversion. Rom. 12:8: he who is over others, with solicitude. II Cor. 11:28: besides those things that are from without, my daily pressure, the solicitude of all the churches. Then, when he says "exhortation," he shows the sincerity of his preaching. And concerning this he does two things: first he proves the sincerity of his teaching; second he explains certain things he had said, at "not as to men." Concerning the first he does two things: first he excludes the corruption of the teaching; second he sets down the sincerity, at "but as approved." Now teaching is corrupted either on account of the matter which is taught, or on account of the intention of the one teaching. On account of the first, teaching is corrupted in two ways, namely either through error, as one teaching that salvation is through Christ together with the legal observances. II Tim. 3:13: evil men and seducers shall grow worse, erring, and sending others into error. Therefore he says: "for our exhortation is not," as that of some, "of error." Or on account of uncleanness, as those who say that one ought to give oneself over to pleasures, which teaching is from a certain Nicolaus, who permitted promiscuous marriages, sharing his wife with another; therefore he says, "nor of uncleanness." Apoc. 2:20: you permit the woman Jezebel, who calls herself a prophetess, to teach and seduce my servants to fornicate, and to eat of things sacrificed to idols, etc. Job 6:30: you shall not find iniquity in my tongue. Likewise, the exhortation is not in guile as that of some, who, although they speak the truth, nevertheless have a corrupt intention, because they seek not the profit of their hearers nor the honor of God, but their own honor. Against which he says, "nor in guile." Jer. 9:8: their tongue is a wounding arrow, it has spoken guile, etc. His preaching, therefore, is not corrupt, but sincere. Now a thing is sincere which preserves its own nature. But preaching is then sincere, when someone teaches with that same tenor and end with which Christ taught. And therefore he says, "but as approved," that is, we speak in that manner and with that intention with which God chose and approved us to preach the Gospel. Gal. 2:7: the Gospel of the uncircumcision was entrusted to me, as that of the circumcision to Peter. Acts 9:15: this man is a vessel of election to me, to carry my name before the Gentiles, and kings, and the sons of Israel. Then, when he says "not as to men," etc., he shows that his preaching is not in guile. First excluding that on account of which it might seem to be deceitful; second he makes it clear through a sign, at "nor at any time"; third through a cause, at "nor on occasion." On account of the first he says: my preaching is not as pleasing men, namely, finally. Ps. 52:6: the bones of those who please men have been scattered. Gal. 1:10: if I pleased men, I would not be the servant of Christ. Sometimes, however, they ought to wish to please men for the glory of God, that preaching may bear more fruit, as is said I Cor. 10:33: I please all men in all things, etc. But God, etc. Prov. 16:2: all the ways of man are open to his eyes. Now the sign of this is that we did not flatter, speaking to them pleasing things. Is. 30:10: speak to us pleasing things, see for us errors, etc. Prov. 24:28: do not flatter anyone with your lips, etc. And he shows the same thing through a cause. For on account of two things does someone seek to please men, namely either for the sake of benefits, or for the sake of glory. But this he excludes here, and first, the first, saying, "nor were we," etc. Because we avoid not only flattery, but also every occasion of avarice. I Tim. 6:5: supposing gain to be godliness. Jer. 6:15: for from the least even to the greatest, all are devoted to avarice. Second, the second, at "nor seeking glory from you nor from others," concerning the teaching, since we might have gloried and received — rather, to be a burden, because they owed him glory and support; whence he says, "since we could." And he calls it a burden, because those preaching to them perversely sought these things from them beyond measure. Is. 3:14: for you have devoured my vineyard, etc. Then, when he says "but we became," etc., he makes clear these two things: first, that he does not seek human glory; second, that neither [does he seek] occasion for avarice, at "for you remember." Concerning the first he does two things: for first he shows his humility; second, under a likeness, he shows his solicitude, at "as if a nurse." He sets down, therefore, the first, saying that "we became little ones," etc., that is, humble. Ecclus. 32:1: have they made you a ruler? Do not be lifted up, but be among them as one of them. This he shows in a likeness, saying "as if a nurse," who, namely, condescends to an infant, speaking to it with stammering, that the child may learn to speak, and in gestures also condescends to it. I Cor. 9:22: I have become all things to all. I Cor. 3:1: as to little ones in Christ, I gave you milk to drink, not food. Even souls. John 10:11: the good shepherd gives his soul for his sheep, etc. Because most dear, etc. II Cor. 12:15: but I will most gladly spend, and be spent myself, for your souls, etc. Then, when he says "for you remember," he shows, second, what he had said above, namely, likewise, "nor by occasion of avarice," because we took nothing from you, but from labor, because "of labor," etc. And some indeed labor, but with comfort; but we did not, but with toil. Therefore he says "of our labor," not for the exercise of the body, but with fatigue. Whence he says "and of fatigue." Some also labor by day, but we, "night and day." For by this he wished to restrain the false [preachers], who received too much, and on account of the idle among them. I Cor. 4:12: we labor, working with our own hands, etc. Then, when he says "for you are," he sets forth the purity of his conduct, and first, how holy, with regard to life; second, how solicitous, with regard to teaching, at "how each one." He says therefore: you know how holily, that is, purely. Lev. 11:44 and 19:2: be holy, because I am holy. Justly, with regard to one's neighbor. Titus 2:12: let us live soberly, and justly, and piously in this age. Without complaint, to you who have believed, that is, from the time you believed, doing nothing whereby anyone could scandalize each one of you individually. Note that individual preaching sometimes avails much. As a father. I Cor. 4:15: in Christ Jesus, through the Gospel, I have begotten you. Beseeching. Philem. 8: having much confidence in Christ Jesus to command you what pertains to the matter, on account of charity I rather beg. And consoling, through gentle words. Against which it is said, Ezek. 34:4: with austerity you commanded them, with power. Is. 61:2: that I might console all who mourn, and grant consolation to those who mourn in Sion. And what did you preach? That worthily, that is, that your conduct might be such as befits the ministers of Christ. Col. 1:10: that you walk worthily of God, pleasing him in all things. Of God, who, etc. Wis. 6:21: therefore the desire of wisdom leads to the everlasting kingdom.”

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“That ye would walk worthy of God,.... In imitation of him; not of his perfections, which are inimitable, but of his works; and these not of his power and wisdom, but those of kindness and beneficence, and of righteousness and holiness; and in conformity to his revealed will, which is good, perfect, and acceptable; and agreeably to his Gospel, that that may be adorned, and not blasphemed; and particularly, in a manner worthy of the calling wherewith saints are called by him: since it follows, who hath called you unto his kingdom and glory; which instance of the grace of God carries in it many arguments, and lays many obligations on the persons interested in it, to walk in their lives and conversations worthy of God; which may be taken from the nature of this call, which is not a mere external one by the outward ministry of the word, but an internal and effectual one, by the powerful and efficacious grace of God; it is a call of persons out of darkness into light, and therefore it becomes them to walk as children of the light, and honestly, as in the daytime; and from a state of bondage to sin and Satan, unto liberty, and therefore ought not to walk after the dictates of corrupt nature, nor the suggestions of Satan, but after the Spirit of God, who is a spirit of liberty; and from fellowship with the world, and the men of it, to communion with Christ, and therefore should not walk as other Gentiles do, nor run with them in the same excess of riot; in short, such are called with an holy calling, and to holiness, and have in their effectual calling principles of holiness implanted in them, and therefore should be holy in all manner of conversation: moreover, arguments may be taken from the consideration of him that calls, God, who is a holy Being, and therefore as he that hath called them is holy, so should they be likewise; he is the God of all grace that has called them, and he has called them by his grace, and to special blessings of grace, and that according to his sovereign will and pleasure; and has called them the most unworthy, base, mean, and despicable, and not others, which greatly enhances the obligation to walk worthy of him: to which add, that he that calls is God that dwells on high in heaven, and changes not, and such is his call; hence it is styled the high calling of God, and the heavenly calling, and said to be without repentance; and therefore the saints should live and walk as pilgrims and strangers here, and be steadfast and immovable, always abounding in the work of the Lord: likewise the consideration of what they are called to should engage them to a becoming walk, being called "to his kingdom"; to the kingdom of grace, which lies in righteousness and peace, and joy in the Holy Ghost, and which cannot be moved, and where they are kings and priests unto God; and unto a Gospel church state, and to all the privileges and immunities of it; and unto the kingdom of heaven, prepared by God for them from the foundation of the world, their Father's free gift to them, of which they are born heirs apparent in regeneration, and have both a meetness for it, and a right unto it; and therefore ought to behave suitable to this high honour and dignity which belong unto them: and this latter sense is the rather to be chose, since it follows, "and glory": or "to his glory", as the Syriac, Arabic, and Ethiopic versions read; to the glory of God, to the beholding of the glory of God through Christ, and the glory of Christ himself; and to a participation of that glory which God has provided, and is in the hands of Christ for them, where it is hid, who when he shall appear, they will appear with him in glory; which will be both upon their souls and bodies; and this will be an eternal glory, a glory that fades not away, and not like the glory of this world, which is transient, and soon passes away, but this will abide for ever; and therefore since the saints are called to the obtaining of this, it is a reason why their conversation should be in heaven now, and as becomes God and his Gospel.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“That ye would walk worthy of God - That they should, in every respect, act up to their high calling, that it would not be a reproach to the God of holiness to acknowledge them as his sons and daughters. See the notes on Eph 4:1; Phi 1:27 (note); and Col 1:10 (note). His Kingdom and glory - His Church here, for that is the kingdom of God among men; and his glory hereafter, for that is the state to which the dispensations of grace in his Church lead. The words, how ever, may be a hendiadys, and signify his glorious kingdom.”
Source
1871
A.D.
1871
“worthy of God--"worthy of the Lord" (Col 1:10); "worthily of the saints" (Rom 16:2, Greek): ". . . of the Gospel" (Phi 1:27) ". . . of the vocation wherewith ye are called" (Eph 4:1). Inconsistency would cause God's name to be "blasphemed among the Gentiles" (Rom 2:24). The Greek article is emphatical, "Worthy of THE God who is calling you." hath called--So one of the oldest manuscripts and Vulgate. Other oldest manuscripts, "Who calleth us." his kingdom--to be set up at the Lord's coming. glory--that ye may share His glory (Joh 17:22; Col 3:4).”
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.