This is to say that I will be giving a lunch time lecture at the Evangelical Library next Monday at 1 pm. It is on Samuel Petto and Samuel Peto. One is a 17th century covenant theologian and the other is a 19th century Baptist entrepreneur. Both are interesting for their own reasons. They apparently share nothing but the name and faith in Christ. (I'm sorry the Library website appears to be down at the moment).
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.