We were a good number last Wednesday (14) as we tackled the next of the solas - Solo Christo (by Christ alone). What I did was to focus on three classic texts - Acts 4:12, 1 Timothy 2:5 and John 14:6. This is all basic stuff but at the heart of what we teach and believe. We had one or two questions at the end as we sometimes do. That was followed by a time of prayer with most people taking part, though certainly not all. I fear that prayer can become a bit of a Cinderella in our thinking at times. I need to put more emphasis on it I'm sure.
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.