Last Lord's Day was interesting and varied. I preached two fairly brief sermons on Revelation 22:6ff and Matthew 8:14-17. We were slow to fill up in the morning. I was pleased to see two visitors who have not been for a while but they did not make it to sermon time for some reason, which is disappointing. There were others missing too, including two children with chicken pox, poor things. We were a decent number in the evening. That was preceded by the Lord's Supper. Part of you feels you're getting nowhere and part feels there's yet hope. The sermons are here and here on our website.
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.