1 Cf. J. LAMBRECHT, "The Right Things You Want to Do: a Note on Galatians 5,17d", Bib 79 (1998) 515-524, for pertinent bibliography and a very good summary of exegetical opinion meant to resolve the problem Gal 5,17d poses. "The Right Things" is the best solution to the thorny problem from an exegetical perspective.
2 Cf. LAMBRECHT, "The Right Things", 517: "The reader asks: does the Spirit, after all, not prevail?".
3 "The NT, especially the Epistles of Paul, contain a variety of harsher parentheses, harsher than a careful stylist would allow. Since Pauls train of thought in general includes many and long digressions..., it is not surprising that his sentence structure even in narrower contexts is not uninterrupted...", F.W. BLASS A. DEBRUNNER R.W. FUNK, A Greek Grammar of the New Testament (Chicago 1961) 243.
4 "As is well known, within Gal 5,16-18 verse 17 defies any easy interpretation", LAMBRECHT, "Right Things", 515.