We normally go to Wales at Christmas but this year we're at home except for a quick trip to see my sister in her new house last Tuesday. While there I took opportunity to get a clip of the family Santa Claus - another memory of my mother. Someone was noisy as I filmed which prompted me to shush them (another memory) in the noisy manner of a drunk - one of my mother's favourite jokes. The next day my sister had got on a bus and the kids were happy to sit over the wheel - a definite "no, no" for us (makes you sick) and yet one more reminder of my mother and her advice.
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.