We were just under double figures last Wednesday evening when we met for Bible study and prayer. I decided to go on in Levitics with the main part of Chapter 14 (leaving the stuff on mould in clothes for later) and focus on when a person is declared unclean from a skin disease. Philip Eveson's Welwyn Commentary is a real gem and I lifted his eight gospel observations straight into my own presentation. (My only contribution was that the two birds show propitiation and expiation - a quick look just now shows that at least one other person agrees but another is much more nuanced). The prayer time was good.
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.