I never know really how long a sermon might be. Last Lord's Day we seemed to have a slightly short one on the morning and quite a long one in the evening. We began with communion in the morning and then the next part of Acts 17 looking at the coming of the gospel to Berea. I also began a new series for the kids on mountains - Ararat first. We were a good number. In the evening we were down to something like 15. My friend Irving Steggles was with us. He had planned to get there in the morning but it didn't work out. This time I went through most of Matthew 23, hopefully in a profitable way. A good day then.
The similar phrase 'Worldly Christianity' is one used by Bonhoeffer. 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.