This morning we had two messages at Assembly from Tim Curnow. The first was on the church and the state and the second on the church and the world. The first message was a very clear and helpful outline of the nonconformist, anti-establishment position as seen in Scripture. The second, more difficult message sought to outline the New Testament position on the Christian and the world. We spent some time after these messages in discussion of both messages, which was helpful. These topics are part of the bread and butter of an assembly like this but it was good to be going over it once again.
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.