What it means
The people who frustrate or oppose us are not the real enemy. Behind visible conflict is an unseen one, and Paul wants us to fight the right battle.
Paul uses the language of wrestling, a close and personal contest. The Ephesians lived in a city famous for magic and the worship of Artemis; unseen powers were not abstract to them.
Where it addresses you
You are tempted to treat a person as your enemy.
A conflict feels bigger than the people involved.
General. Not on a curated Path.