Watchman Nee first divided the book of Ephesians into 3 basic sections in his book, Sit, Walk, Stand. It's a simple and profound reminder that our entire life is meant to be lived out from the finished work of Christ on our behalf.
Sit - Our position in Christ (Eph. 1:20, 2:6)
Walk - Our life in this world (Eph. 4:1, 17, 5:2, 8b)
Stand - Our attitude toward Satan (Eph. 6:13-14)