We had a bumper turn out last night mainly because we had a few students back before they head off on various exploits for the summer. We looked at Philippians 4:10-19 and the matter of giving to others - a cause of joy in the Lord, when opportunity arises, etc, including material on contentedness which is so important. A good time of prayer followed.
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.