Paul has chased a serious concern through his entire letterSo it is not surprising that near the end, he would present an the ultimate challenge of the Christian life- in verse 16 Paul begins last segment of his central message• what follows in chapter 6 is his concluding remarks and directions- what we have in verses 16-25 is this chunk of scripture that tracks one theme• Paul makes this clear by marking where it begins and ends•it begins in verse 16, “walk by the Spirit,” and in ends in verse 25, “live by the Spirit”◦ in scripture, framing a passage this way is common, and is referred to as an envelope structure or closing circle◦ anyway, the literary structure reveals the heart of the passage–it’s one key point