Our relationships with God and with one another Go Beyond what was possible in the Garden of Eden! This is the Great Revelation (or Mystery) Paul refers to in the high point of the passage of Ephesians 5:15-6:9 in verse 32. This is not the longest passage on marriage. That is only a sub-theme in part of the passage. This is not a passage on submission or on headship at all!
We must first find the limits of the well-built passage in Ephesians 5-6. Then we can notice the main parts of this long passage. And only thirdly can we look at words, phrases and verses in their appropriate places in the development of thought in the whole passage.
The Book of Ephesians in chapters 4-6 is written in six major Sections. each one starting with "therefore walk." In Ephesians 5-6 the start is in verse 15 which begins with "Therefore walk ...." The next Section begins in 6:10 with the words "Therefore stand...."
There is a jump, jump, high jump structure in Section 5. There are four points made in 5:15-18, and four more made in 5:19a-21. These are the first two "jump" portions. The "high jump" portion runs from 5:19-6:9 and the center or high point is located in 5:32. This is the defining idea of the entire passage. But who has pointed you to it before? Some commentators hardly mention verse 32 at all.
Want to go deeper? Please listen to Season Two of The Eden Podcast. Better still, get a copy of the book Beyond Eden, Ephesians 5:15-6:9 by Bruce C. E. Fleming. Each chapter has an added 3-5 page Study Guide!