But before faith came, we were kept under the law, shut up unto the faith which should afterwards be revealed.
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Augustine of Hippo
AD 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.
Sal 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."
Before faith came. Like slaves under the stern 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.
The law was not empty or against the promises. How does he say it was necessary? Because it looked forward to the faith that was to be, and the promise came through faith. “First,” he says, “before the law came we were under a tutor; that is, under the law as a sort of custodian and guardian we lived a life that was pure through the avoidance of and repentance for sins, so that when Christ came we, being as it were confined for the purpose of that faith which was to come, should expect his coming; and being prepared through the law, should have faith in him; and, as we avoided sin and did the works of the law, should easily be able to have what was promised from his advent, namely, faith in Christ.” .
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.