I was sat drinking coffee in a coffee shop and I came to the famous part of the Confessions where Augustine is converted (I mean the Tolle Lege bit). Anyway after reading it once again and being moved by it I looked up and I noticed on the other side of the street there was one of these fellows who walks around with a stick and something written on it (probably Jesus) as a way of witnessing. As he walked along with his friend a woman shouted something at him - probably not complimentary. She and her friend appeared to be people with a drink problems. After stopping briefly he walked on with his friend and she and her friend headed the other way so that we six soon briefly formed a triangle - me and Augustine in the coffee shop, the professing Christian and his friend at one angle and the two alcoholics at the other. Augustine was once as lost as the drunks and so was I but God saved him (and me) as he saved the man witnessing and his friend I hope.
Bonhoeffer uses a similar phrase 'worldly Christianity'. It's J Gresham Machen that I want to line up most closely with. See his Christianity and culture here. Having done commentaries on Proverbs (Heavenly Wisdom) and Song of Songs (Heavenly Love), a matching title for Ecclesiastes would be Heavenly Worldliness. For my stance on worldliness, see 3 posts here.