I've posted this footage before but I heard yesterday that Richie Havens had died at the age of 72 and thought it worth putting up again. His claim to fame was opening at Woodstock in 1969.
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.