The apostle Paul, after having stated key doctrinal aspects of his letter progresses to the applicatory section in chapters 4-6.
The Epistle written to the saints at Ephesus expresses some of the most sublime Christological aspects in nearly every sentence or implied. In the said three chapters, we learn how deep and wide is the love of God given to the Church in eternity past. Unity and purity and running themes for the elect of God who are expected to live worthy of their calling. The Christian should rejoice in Gods goodness.