It has been sad this week to hear of the death of Welsh speaking Welshman Rhodri Morgan, former Welsh first minister. He was the man who gave one of my sons his degree when he graduated (Cledwyn Hughes gave me mine, Cled the Red). I like the anecdote that tells how Tony Blair once stayed at Mr Morgan's house. Apparently Tony Blair was up early in the morning and so was Morgan's mother-in-law. When she came into the kitchen an saw him she blurted out "I know who you are, You're that Lionel Blair"!. Morgan confirmed the truth of the story in an interview with David Frost some time.
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.