At First Things you can read article by Dr. Peter J. Leithart on the worldliness of God. One could mediate on Leithart’s musings at length.

Christian worldliness is cruciform: We seek the world’s good by denying ourselves and sharing the cross of Jesus. To get this right, we have to move in circles: We worship God, but worshiping the Triune God drives us back to the world God rescues; we serve this world, but we offer up our service to God, the God who rescues the world. 

However we keep our balance on the tightrope, it is clear that we cannot follow Jesus without sharing His passion to see the world redeemed. For Christians, the issue is never whether to be worldly but how.