For he who was called in the Lord as a bondservant is a freedman of the Lord. Likewise he who was free when called is a bondservant of Christ.
22. For he that is called in the Lord, being a servant To be called in the Lord, being a servant, is to be chosen out of the rank of servants, and made a partaker of the grace of Christ. Now this statement is designed to furnish consolation to servants, and, at the same time, to beat down the haughtiness of those that are free-born.
Here the apostle takes occasion to advise them to continue in the state and condition in which Christianity found them, and in which they became converts to it. And here, I. He lays down this rule in general - as God hath distributed to every one. Note, Our states and circumstances in this world are distributions of divine Providence. This fixes the bounds of men's habitations, and orders their steps.
Commenting on 1 Corinthians 7:17-24
For he that is called in the Lord,.... Which is to be understood, not of any civil calling, or of calling to an office; or of the outward call by the ministry of the word only; but of an internal, special, powerful, evangelical, and saving call by the grace of God; which is of persons out of darkness into light, out of bondage into liberty...