I'm sorry to be so predictable but once again it's good old Charles Wesley. That line in verse 2 "Where saints in an ecstasy gaze, And hang on a crucified God;" is just amazing from many points of view.
1 Thou Shepherd of Israel, and mine,
The joy and desire of my heart,
For closer communion I pine,
I long to reside where thou art:
The pasture I languish to find
Where all, who their Shepherd obey,
Are fed, on thy bosom reclined,
And screened from the heat of the day.
2 Ah! show me that happiest place,
The place of thy people's abode,
Where saints in an ecstasy gaze,
And hang on a crucified God;
Thy love for a sinner declare,
Thy passion and death on the tree:
My spirit to Calvary bear,
To suffer and triumph with thee.
3 'Tis there, with the lambs of thy flock,
There only, I covet to rest,
To lie at the foot of the rock,
Or rise to be hid in thy breast;
'Tis there I would always abide,
And never a moment depart,
Concealed in the cleft of thy side,
Eternally held in thy heart.
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.