John Chrysostom
Did you free yourselves, that you again hasten under the former dominion? He Himself, Christ, redeemed you. Did another pay the ransom for you? Do you see how many means the Apostle uses to turn them away from the Jewish error? First, he shows that it is utterly foolish for those who became free from being slaves to wish to become slaves again after being free. Second, he makes them understand that, by despising the Liberator and loving the enslaver, they prove cruel and ungrateful toward their Benefactor. Third, he teaches that this is now impossible, since the Law lost its dominion after another redeemed us all from it once for all. By the word stand he indicates their inconstancy and wavering. And do not be held again under the yoke of bondage.
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By the word yoke he depicts the weight of the Law. By saying again, he reveals their great insensibility. If you had not experienced this weight yourselves, you would not yet deserve such reproaches. But if you know by experience the whole weight of this yoke, and despite this again submit to it yourselves, do you deserve any excuse?