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.
All Commentaries on 1 Corinthians 7:22 Go To 1 Corinthians 7
Oecumenius
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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. .