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 culturehere. 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.
Gwent Castles 02
White Castle/Castell Gwyn
I must confess I don't recall ever seeing White Castle (Castell Gwyn).
It's somewhere up Abergavenny way. Looks quite good. More here