On Monday evening it was my great privilege to be at the Evangelical Library to hear Ian Hamilton speaking on the theology of Old Princeton. It was an excellent lecture, popular in the best sense and gave a real flavour of the stature of the Princeton giants - Hodge, Warfield, Alexander, etc. The only disappointment was the relatively poor turn out, which as more like twenty than the forty we might have expected. This was probably due to the lecture being given in July rather than the June date it normally gets. I'm sure I also over-estimate the familiarity of the Christian public with these things and in the publicity I should have put a bigger emphasis on the fact that this is a bi-centennial year for Princeton and the fact that it was until 1929 the home of Reformed theology. The recording can be obtained from the Library and will hopefully appear in print form in due time.
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.