Evangelical Holiness and other addresses is the latest Banner book from Iain Murray. It contains five addresses - Evangelical Holiness (given at Keswick), The attack on the Bible (given to C of S ministers), Apostasy, The Benefits and dangers of controversy and Rest in God. The last essay repeats his booklet on the subject, previously published by Banner but it fits in here. As ever what you are getting here is clear thinking Reformed theology backed up by a vast knowledge of western history that sees him quote a massive range of writers and give some fascinating footnotes. The index is a real help but a select bibliography might have been worth adding too.
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.