Church was a little bit different yesterday in that we are on holiday here in the wilds of Brittany and so we decided to have church here. My father-in-law preached in the morning and I preached in the evening. We sang psalms unaccompanied. We are 17 altogether so decent congregation aged 5-74 (we would be 18 if my daughter-in-law could have been here too). Geoff took us to Romans 15:13 and I went for Ecclesiastes 11:7-12:7 given that half of us are young people. We were inside in the evening as summer storms threatened but it was best in the garden under a covered dining area in the morning. The sound of the birds and the sight of butterflies added to the experience rather than detracting.
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.