Such a Great Quote from John Piper

From the classic, Desiring God:

Someone may ask, “If your aim is conversion, why don’t you just use the straightforward, biblical command ‘Believe in the Lord Jesus, and you will be saved’ (Acts 16:31)? Why bring in this new terminology of Christian Hedonism?”

My answer has two parts. First, we are surrounded by unconverted people who think they do believe in Jesus. Drunks on the street say they believe. Unmarried couples sleeping together say they believe. Elderly people who haven’t sought worship or fellowship for forty years say they believe. All kinds of lukewarm, world-loving church attenders say they believe. The world abounds with millions of unconverted people who say they believe in Jesus. It does no good to tell these people to believe in the Lord Jesus. The phrase is empty. My responsibility as a preacher of the gospel and a teacher in the church is not to preserve and repeat cherished biblical sentences, but to pierce the heart with Biblical truth. In my neighborhood, every drunk on the street “believes” in Jesus. Drug dealers “believe” in Jesus. Panhandlers who haven’t been to church in forty years “believe” in Jesus. So I use different words to unpack what believe means. In recent years I have asked, “Do you receive Jesus as your Treasure?” Not just your Savior (everybody wants out of hell, but not to be with Jesus). Not just Lord (they might submit begrudgingly). The key is: Do you treasure Him more than everything? Converts to Christian Hedonism say with Paul, “I count everything as loss because of the surpassing worth of knowing Christ Jesus my Lord” (Philippians 3:8).

This leads to the second part of my answer. There are other straightforward biblical commands besides “Believe in the Lord Jesus, and you will be saved.” The reason for introducing the idea of Christian Hedonism is to force these commands to our attention. Could it be that today the most straightforward biblical command for conversion is not, “Believe in the Lord,” but, "Delight yourself in the Lord”? And might not many slumbering hearts be stabbed broad awake by the words “Unless a man be born again into a Christian Hedonist he cannot see the kingdom of God”?”   (my emphasis)

Get the book here.

(HT:  Yancey)