So I'm taking a coffee, as I do, and in come a man and his son (about 12) and sit on one of the sofas. The father orders something but the main topic is getting a speech onto the laptop. The speech has been written but the father wants to do some tweeking, quite a lot of tweeking as it turns out. I assumed the father was Eastern European at first but I guess he was Israeli. The speech is for the boy's Barmitzvah and not only is there no secrecy or diffidence on the man's part, he is quite brazen not only about getting the son to completely rearrange the speech but to include whole sections he dictates, including one where the son has to say how blessed he is to have such brilliant great grandparents, grandparents and, you guessed it, parents too! What I liked best was the son's complete co-operation - not a murmur of complaint and yet no meek acceptance either, really - just a "this is a rite of passage I have to go through. This too will pass."
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.