1 Corinthians 7:21

Astonishing! where has he put slavery? As circumcision profits not: and uncircumcision does no harm; so neither doth slavery, nor yet liberty. And that he might point out this with surpassing clearness, he says, "But even if thou canst become free, use it rather:" that is, rather continue a slave. Now upon what possible ground does he tell the person who might be set free to remain a slave? He means to point out that slavery is no harm but rather an advantage. Now we are not ignorant that some say, the words, "use it rather," are spoken with regard to liberty: interpreting it, "if thou canst become free, become free." But the expression would be very contrary to Paul's manner if he intended this. For he would not, when consoling the slave and signifying that he was in no respect injured, have told him to get free. Since perhaps some one might say, "What then, if I am not able? I am an injured and degraded person." This then is not what he says: but as I said, meaning to point out that a man gets nothing by being made free, he says, "Though thou hast it in thy power to be made free, remain rather in slavery."