The interpretation timeline
Galatians 3:23 Douay-Rheims

But before the faith came, we were kept under the law shut up, unto that faith which was to be revealed.

A.D. 215 – 1871 8 witnesses

Patristic

before A.D. 750
215
A.D.
c. A.D. 150–215
“For that faith is the one universal salvation of humanity, and that there is the same equality before the righteous and loving God, and the same fellowship between Him and all, the apostle most clearly showed, speaking to the following effect: "Before faith came, we were kept under the law, shut up unto the faith which should afterwards be revealed, so that the law became our schoolmaster to bring us to Christ, that we might be justified by faith; but after that faith is come, we are no longer under a schoolmaster." Do you not hear that we are no longer under that law which was accompanied with fear, but under the Word, the master of free choice?”
Source
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“Here he clearly puts forward what I have stated: for the expressions "we were kept" and "shut up," signify nothing else than the security given by the commandments of the Law; which like a fortress fenced them round with fear and a life conformable to itself, and so preserved them unto Faith.”
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“No person should be unwise enough to say here, "Why then was it no profit to the Jews that they were put in the hand of a Mediator through angels dispensing the law?" It was profitable to them beyond what can be expressed. For what churches of the Gentiles sold their possessions and put the price of them at the apostles' feet, which so many thousands of people so quickly did? … And when he praises the church of the Thessalonians before all other churches, he says that they have become like the churches of the Jews, because they had suffered many things from their people on account of their faith, as the others had from the Jews. … And the consciousness of a greater sickness, that they were found to be transgressors of the law itself, worked not to the ruin but to the good of those who believed, causing them to desire more fervently a doctor and to love him with more ardor.”
Source

Scholastic

c. 1100 – 1500
1273
A.D.
Thomas Aquinas Catholic
1225–1274
“Here the Apostle raises another doubt, namely whether the law is harmful to grace. And first he raises the doubt, saying "Is the law then," etc., as if to say: if the law was established on account of transgressions, does the law then act against the promises of God — namely, so that what God promised he would do through the promised seed, he does through something else? God forbid. As if to say: no. For above, in the same place: "the law does not make void the covenant so as to nullify the promises," etc. Romans 7:12: "the law is holy, and the commandment holy." Second, when he says "For if a law had been given," etc., he resolves the doubt. And first he shows that the law is not against the promises of God; second, that it is in service of the promises, at the point "but concluded," etc. He says, therefore, that although the law was established on account of transgressions, it is nevertheless not contrary to the promise of God, because it cannot remove the transgressions themselves. For if it did remove them, then it would clearly be against the promises of God, because justice would be through another way than the one God promised — since it would be through the law and not through faith — whereas nevertheless it is said, Habakkuk 2:4: "my just one lives from faith." Romans 3:22: "the justice of God is through the faith of Jesus Christ." And therefore he says that if a law had been given of such a kind that it could give life — that is, were of such power that it could confer the life of grace and eternal blessedness — then truly, and not merely apparently, justice would be from the law, if the law did what faith is said to do; and thus faith would be in vain. But the law does not justify, because the letter — namely, of the law — kills, as is said in 2 Corinthians 3:6, and Romans 8:2: "for the law of the spirit of life in Christ Jesus," etc. Then when he says "but Scripture concluded," etc., he shows that the law not only is not contrary to grace but is even in service to it. And first he shows that the law serves the promises of God; second, how this service was made manifest among the Jews, at the point "but before faith came," etc.; third, how the Gentiles too, without the law, obtained the promises of God, at the point "for you are all sons of God," etc. Concerning the first, it must be known that the law serves the promises of God in general with respect to two things. First, because it manifests sins. Romans 3:20: "through the law, knowledge of sin." Then, because it manifests human weakness, inasmuch as man cannot avoid sin except through grace, which was not given through the law. And just as these two things — namely, knowledge of the disease and the powerlessness of the sick person — greatly induce one to seek a physician, so knowledge of sin and of one's own powerlessness induce one to seek Christ. Thus, then, the law served grace, insofar as it supplied knowledge of sin and experience of one's own powerlessness. And therefore he says "Scripture" — that is, the written law — "concluded," that is, it held the Jews shut in, "under sin" — that is, it showed them the sins that they were committing. Romans 7:7: "I did not know concupiscence," etc. Likewise it "concluded," because with the law coming they took occasion for sin. Romans 11:32: "God has concluded all things under unbelief," etc. And this was so that man might seek grace. And therefore he says "that the promise" — that is, the grace that had been promised — "might be given not only to the Jews, but to all believers," because that grace was able to free from sins, and this grace is from the faith of Jesus Christ. Then when he says "but before it came," etc., he sets forth the experience of this service made manifest among the Jews. And first he sets forth the service rendered to the Jews; second, he draws a certain corollary, at the point "therefore the law was our pedagogue," etc. He says, therefore: if Scripture — that is, the written law — held all things shut in under sin, what benefits did the Jews have from the law before faith came from grace? He answers and says: we Jews, before the coming of faith, were kept under the law, inasmuch as it made us avoid idolatry and many other evils; we were kept, I say, not as free men, but as it were as servants under fear, and this "under the law" — that is, under the burden and dominion of the law. Romans 7:1: "the law has dominion over a man for as long as he lives," etc. And we were kept "shut in" — that is, preserved lest we should slip away from life, but were being prepared for it — that is, for that so-good faith which was to be revealed. Isaiah 56:1: "my salvation is near, that it may come, and my justice, that it may be revealed." And he says "to be revealed," because since faith exceeds every human intellect, it cannot be had through one's own understanding, but from revelation and the gift of God. Isaiah 40:5: "the glory of the Lord shall be revealed," etc. Or: for that faith which was to be revealed in the time of grace, lying hidden in ancient times under many signs. Whence also, at the time of Christ, the veil of the temple was torn, Matthew 27:51. Consequently, when he says "the law was our pedagogue," etc., he draws a certain corollary. And first he shows the office of the law; second, the attestation of that office, at the point "but when the fullness of time came," etc. Now the office of the law was the office of a pedagogue, and therefore he says "the law was our pedagogue," etc. For as long as an heir cannot obtain the benefit of the inheritance, whether on account of a deficiency of age or of some due perfection, he is kept and guarded by some instructor, and this instructor indeed is called a "pedagogue," from "paidos," which means "boy," and "agoge," which means "leading." For through the law the Jews, like weak children, were held back from evil through fear of punishment, and were advanced toward the good by the love and promise of temporal things. Now to the Jews was promised the blessing of the future seed with a view to obtaining the inheritance, but the time of obtaining that inheritance itself had not yet come. And therefore it was necessary that they be preserved until the time of the future seed, and be restrained from unlawful things — which was accomplished through the law. And therefore he says "therefore," etc., as if to say: since we were kept under the law, the law was our pedagogue — that is, directing and preserving us "in Christ," that is, in the way of Christ. And this was so that we might be justified from the faith of Christ. Hosea 11:1: "Israel a child, and I loved him." Jeremiah 31:18: "you have chastised me, Lord, and I was instructed," etc. Romans 3:28: "for we reckon that a man is justified through faith," etc. And although the law was our pedagogue, it nevertheless did not lead to the perfect inheritance, because, as is said in Hebrews 7: "the law brought no one to perfection," etc. But this office ceased after faith came. And this is what he says: "but when faith came" — namely, the faith of Christ — "we are now no longer under a pedagogue" — that is, under a coercion which is not necessary for free men. 1 Corinthians 15: "when I was a child," etc.; "but when I became a man," etc. 2 Corinthians 5:17: "if then any new creature in Christ, the old things have passed away," etc.”

Reformation

c. 1500 – 1650
1637
A.D.
1567–1637
“Before faith came. Like slaves under the stem discipline of the law, we were kept as though by walls and hedges from sin, and were held, and kept in, that we might be thereby prepared, and might learn to long for the righteousness which Christ should give”

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“But before faith came,.... This is to be understood, not of the grace of faith, which was under the former dispensation, as now; the Old Testament saints had the same Spirit of faith, and the same grace of faith, as for its nature, object, and use, as New Testament saints have; Adam, Abel, Enoch, Noah, Abraham, &c. believed in Christ, and were justified by faith in his righteousness, as we are. It is much better to understand it of the doctrine of faith, which though preached to Adam, and by Noah, and to Abraham, and by Isaiah, and others, yet not so clearly, largely, and fully, as by Jesus Christ and his apostles; so that the times of the Gospel may be called the times of faith, in comparison of the times of the law, and which some think is here meant; but it is best to interpret it of Christ, the object of faith, who was to come, and is come in the flesh, to fulfil the law; and, by so doing, has put an end to it; and to redeem his people from under it, and to save them with an everlasting salvation; for before this his coming in the flesh, the people of the Jews, of whom the apostle was one, were under the law: we were kept under the law; as persons in a garrison, as the word signifies; they were kept distinct and separate from the rest of the nations of the world, and had neither civil nor religious conversation with them; and so were preserved in some measure both from their impieties and idolatries, which otherwise they were naturally prone to; and as a distinct people, unto the coming of the Messiah, who was to arise from among them; so that their being kept under the law in this sense, was both for their honour and their safety: though the meaning may also be, that they were kept under it as persons under a military guard, as the word likewise imports; and signifies, that the law kept a strict guard and a watchful eye over them, as the Roman soldier had over Paul, that kept him, and held fast the chain in his hand, with which he was bound, that he might not get loose and escape from him; see Act 28:16 to which the apostle seems here to allude; the law kept them close to the discharge of their duty, and held them fast as prisoners; and which is more fully expressed in the next clause, shut up. The Syriac version reads this in connection with the former, thus, "the law kept us shut up", as in a prison; and the same way reads the Arabic version; which shows the state and condition the Jews were in under the law, and how they were treated by it; not as good and righteous persons, but as persons in debt, as criminals and malefactors; a prison is made, and so the law, for such sort of persons; the law considered and used them as sinners, as criminals convicted and condemned; it did itself accuse, convict, and pronounce them guilty, and condemned them to punishment; and detained them as prisoners in its dark dungeon, where they had little light and comfort; and were as in a pit, wherein is no water; though they lay here as prisoners of hope, in expectation of the Messiah's coming; who was to proclaim liberty to the captives, and the opening of the prison to them that are bound, and to say to the prisoners, Come forth, and to them that sit in darkness, Show yourselves. Also the allusion may be to the custom of the eastern nations, in the usage of their slaves and captives; who in the daytime used to grind at a mill in a prison house, and in the night time were put down into a pit and shut up, and a mill stone put to the mouth of the pit (p); and so describes the state of bondage and slavery the Jews were in under the law, who differed nothing from servants, to whom the saints under the Gospel dispensation are opposed, Gal 3:26 as being the children of God by faith in Christ. And in this uncomfortable condition they continued, unto the faith which should afterwards be revealed; that is, until Christ the object of faith came, who was to be revealed, or made manifest in the flesh; who, before his incarnation, not only lay in the bosom of the Father, but was in a great measure hid under the types and prophecies of the Old Testament; which though they gave some hints of him, yet but obscure ones, in comparison of the revelation made of him by his appearance in human nature; by the testimonies of his Father by a voice from heaven of angels, of John the Baptist, and others; and by his own doctrines and miracles, and by the spirit of wisdom and revelation in the knowledge of him. (p) Schindler Lex. Pentaglott. in voce col. 1712.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“But before faith came - Before the Gospel was published. We were kept under the law, shut up - Εφρουρουμεθα· We were kept as in a strong hold, συγκεκλεισμενοι, locked up, unto the faith - the religion of the Lord Jesus, which should afterwards be revealed. Here the same metaphor is used as above, and for its explanation I must refer the reader to the same place, Rom 11:32 (note).”
Source
1871
A.D.
1871
“faith--namely, that just mentioned (Gal 3:22), of which Christ is the object. kept--Greek, "kept in ward": the effect of the "shutting up" (Gal 3:22; Gal 4:2; Rom 7:6). unto--"with a view to the faith," &c. We were, in a manner, morally forced to it, so that there remained to us no refuge but faith. Compare the phrase, Psa 78:50, Margin; Psa 31:8. which should afterwards, &c.--"which was afterwards to be revealed."”
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.