Principalities and Powers in Ephesians
I'm greatly enjoying reading Against Principalities and Powers: Spiritual Beings in Relation to Communal Identity and the Moral Discourse of Ephesians by Daniel Darko (published 2020 by Hippo Books).
He explores the significance of the spiritual powers in Paul's letter to the Ephesians, suggesting that we in the West often don't feel the full force of the letter's message because we are not atuned to see this as important.