Edith Wharton (1862 – 1937) was a Pulitzer Prize-winning (with Age of Innocence) American novelist, short story writer and designer. She was nominated for the Nobel Prize in Literature in 1927, 1928 and 1930. She combined her insider's view of America's privileged classes, they say, with a brilliant, natural wit to write humorous, incisive novels and short stories of social and psychological insight. She was well acquainted with many of her era's other literary and public figures, including President Roosevelt. She wrote a stack of novels. I have only read Ethan Frome which I really enjoyed.
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.