theologically

-make them lose their faith in happiness as the Sovereign Good and take to believing instead, that the goal was somewhere beyond, somewhere outside the present human sphere; that the purpose of life was not the maintenance of well-being...

A sermon preached but yet not practiced will fail to touch the hearts of its listeners and will never bring glory to God rather it will become a loathsome sacrifice that will stink on broken altars. One can be theologically astute but still very immature. One can possibly be biblically literate but still in very much need of wisdom to apply the truth in one's own life.