Matthew Poole and continuators on 1 Corinthians 7:21

21 Art thou called being a servant ? care not for it: but if thou mayst be made free, use it rather .

If whiles thou art a servant to another in any honest imployment, thou art converted to the Christian Religion, let it not trouble thee, matter it not. A man may be the servant of Christ, and yet a servant to men in any honest imployment.

But if thou mayst be made free by the favour of thy friends with the consent of thy master, use it rather, that is, (say some) rather chuse to be a servant still (which indeed in some cases may be the duty of a good Christian) that is, if thou seest, that in that station thou canst better serve God and the interest of thy masters or other Souls. But it is more probable the sense is, make use of thy liberty rather: for certain it is, that the freeman is ordinarily at more advantage for the service of God than he that is a servant.