For he that is called in the Lord, being a servant, is the Lord's freeman: likewise also he that is called, being free, is Christ's servant.
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Ambrosiaster
AD 400
Whoever has been delivered from sin is truly free. The ancients used to say that anyone who acts unwisely is a slave. They called all wise men free, and all the unwise were slaves as far as they were concerned. In any case, even a free believer is a slave of Christ, for to be free from God is the greatest sin of all. Commentary on Paul’s Epistles.
Paul wants to show that slave and master are equal. We are all freedmen of Christ because he has set us free from the tyranny of Satan, and we are voluntary slaves of Christ because, having set us free, he led us into his own kingdom. .
