Our reading group at the John Owen Centre looked at Augustine's Confessions the other week and I bought this little book in the series Lives of great religious books. First, let me say what a nice book it is to handle - a properly bound hardback with clear print. I think Mr Wills is a Roman Catholic but he seeks to be objective and so this does not intrude too much. What you get is a helpful analysis of the contents of this Christian classic, along with some idea of the history of the scholarship with regard to it and something on its origins and subsequent reception. I found this an enjoyable and stimulating work. The fresh analysis of the famous conversion was interesting. It is perhaps how surprising how evangelicals rightly or wrongly are able to see it in a light that appears to be obscure to other observers.
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.