I thought some of you might enjoy this. For most of us it will be better to listen than to look. Aah, the seventies, eh? Charles O'Connor's little guitar is a specially made electric mandolin. BTW I am, of course, rooting for the Welsh tonight not the Irish.
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.