Slavery shows the general idea mentioned in 1 Corinthians 7:17, 20, 24. Slavery was common in the Greco-Roman world, and many Christian converts were slaves serving wealthy families. According to Paul, like circumcision, being a slave is not very important for a Christian. Even as a slave, a Christian is spiritually free from sin, death, and the law (see Romans 6:14; 7:4–6; 8:2). As a free person, the believer is still a servant of Christ (see Ephesians 6:5–6; 1 Peter 2:16).
As someone bought at a high price, the free Christian should not be controlled by the world (see 1 Cor 6:20).