John Chrysostom
Therefore Paul does not mean this, but wishes to show, as I said before, that one freed from slavery gains no benefit. Even if it were in your power to become free, he says, rather remain a slave. Then he gives the reason: “For the slave called in the Lord is the Lord’s freedman. Likewise the one called free is Christ’s slave” (1 Cor 7:22). In relation to Christ, he says, both are equal. As you are Christ’s slave, so also is your master. But how can a slave be free? Christ has freed you not only from sin, but also from outward slavery, though you remain a slave. He does not allow the slave to be a slave, nor the man to remain in slavery. This is the wonder. When is a slave free while remaining a slave? When he is freed from passions and diseases of the soul.
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When he does not surrender to greed, anger, and other similar passions. “You were bought with a price. Do not become slaves of men” (1 Cor 7:23). Slavery is the consequence not of nature, but of sin. “Were you called as a slave? Do not be anxious” (1 Cor 7:21). Do you see how here also the Apostle shows that slavery is an empty word when virtue is present? “But if you can become free, make use of what is better,” that is, remain all the more in slavery. Why? “For the slave called in the Lord is the Lord’s freedman.” Do you see that slavery remains only in name, while in reality there is freedom? But why did he permit the believer to remain a slave? So that you might know the excellence of freedom. The preservation of the three youths unharmed in the furnace was far more wondrous while the furnace remained burning than if it had been quenched. So the continuation of slavery is a far greater and more wondrous testimony to freedom than its abolition. Therefore he says: “But if you can become free, make use of what is better,” that is, remain a slave, because you possess the truest freedom.