Interesting thoughts. I have some problems with us being slaves of each other. I think that Paul saying that he enslaves himself for others can’t really be used in support given that it is A) being used in a metaphorical sense and B) he is saying this about what he is to unbelievers.

I consider myself a slave to Christ but not to other believers. I think we can do A–D without considering ourselves slaves.

For doulos, some translations use servant, others bondservant, others slave. With various reasons given for each word choice.

Is there a voluntary component to the word? Would bondslave be an appropriate word?

Paul,

Thank you for a hard hitting, but very encouraging sermon. You are right, it’s not something we hear much these days.

We all need exhortation and encouragement to “get on with” the life God wants us to live in His Spirit.