Atonement is another in the series that includes Solid Ground reviewed earlier. This one on a very relevant subject is assembled in the same way, using past sermons at the Philadelphia Conference organised by ACE and edited by Gabriel Fluhrer. The contributors are Packer, with an excellent message on the Necessity of the atonement, Boice (propitiation), Sproul (satisfaction), Gerstner (Limited atonement), Ferguson, De Witt (reconciliation) and Alistair Begg.
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.