Somehow I missed this volume last year - Hebrew teacher John Currid's Calvin and the Biblical Languages. A straightforward book of only about a hundred pages it neatly sets out the facts concerning Calvin and the biblical languages. The thesis is that though Calvin was not an outstanding scholar in Greek or Hebrew he did use the languages and encouraged others to use them. Indeed he did more than many to encourage the use of the bibklical languages. Currid's argument is that use of the original languages is really a Reformation principle and one that we neglect at our peril. He has a compelling case and I for one felt a little ashamed of my laziness in this area. Details here.
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.