At 14.13 today in Aberystwyth my first grandson Gwilym Arthur safely arrived. Apparently he's a whopping 9lb 5ozs and he has timed it to be two days overdue (stylishly late) and on the day before his mother's own birthday. The names were agreed on for various reasons but it is the Welsh form of William (the name of my grandfather, dad and nephew, etc) is popular in my family. One of my sons also has it as a second name and it was the name of the first boy I met in infants school. Llongyfarchiadau to the proud parents.
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.