Big Idea: A new heart is a single heart with one way and one path to live. The way to a happy life is a long obedience in the same direction.
"I will give them one heart and one way (singleness of heart and action), that they may fear me forever, for their own good and the good of their children after them" (Jer 32:39).
The heart of the matter is a matter of the heart. "Above all else guard your heart, for everything you do flows from it" (Prov 4:23).