The similar phrase 'Worldly Christianity' is one used by Bonhoeffer. 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.
We had another two good sessions last night. First, Andy Hambleton of the EPC spoke on Mark 6:31 and the importance of a balance in the ministry so that we take time to rest. It was good to have that note sounded and in a realistic way. Then after supper we went into overdrive as Conrad Mbewe took us through the rest of the first chapter of 1 John.
