Christian biography is the theme for the July edition of the Banner magazine. It includes a stimulating commendation of the subject by Derek Prime and an introduction to the other Brainerd (John) by Mack Tomlinson. I currently have Lloyd-Jones and Archibald Brown on the go and am keen to get back to Bavinck and William Williams but would also like to get into John Blanchard but all these projects are pretty much on hold this week as I'm reading up on the Trinity. Never enough hours, eh?
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.