We were back up to 10 people last Wednesday partly because a man turning up who comes often on Sunday but who has never been midweek before. It was a good stand alone text to be looking at - 2 Timothy 3:16, 17. This is the very first text I preached on when I began my ministry here all those years ago. We also spent time in prayer, of course. A good time.
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.