Slavery

Started reading the Book of Revelation, alongside Unveiling Empire, in preparation for a workshop I'll be running for NCYC in January.

The revelation of Jesus Christ, which God gave him to show his servants [or slaves] what must soon take place; he made it known by sending his angel to his servant [or slave] John, who testified to the word of God and to the testimony of Jesus Christ, even to all that he saw.
(Revelation 1:1-2)

Thinking about what it means for Christians living in the Roman Empire around 100 AD to identify as God's slaves. We know that some of the early church were owned as slaves, and I wonder what their masters would have thought of the idea that their slaves now belonged to God? If you're a slave to God, does that mean you're free to do God's work, rather than your master's work? And each Christian is God's slave, does that mean they're all equal?