TL

“I would hardly call the subjection of devils to apostles “voluntary”!”

I wouldn’t either. But if the devils subjected themselves, it would be. A lot depends on the subject and object. In the above, the devils are being made subject to another, the apostles. Not voluntary. But when wives are told to subject themselves , it comes out the woman is subjected BY the woman. It is not possible to do this involuntarily.

May your studies go well. 🙂