Do You Delight in God?
From John Piper’s book Desiring God.
“…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.
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”?” – John Piper
The above quote is from the web version of Desiring God, and not the book. If you can get a copy of the book you should do so. From what I have seen the book has additional material left out of the web version.