"This was the great coming together for me. What was life about? What was it for? Why do I exist? Why am I here? To be happy? Or to glorify God? Unspoken for years, there was in me the feeling that these two were at odds. Either you glorify God or you pursue happiness. One seemed absolutely right; the other seemed absolutely inevitable. And that is why I was confused and frustrated for so long.
Compounding the problem was that many who seemed to emphasize the glory of God in their thinking did not seem to enjoy Him much. And many who seemed to enjoy God most were defective in their thinking about His glory. But now here was the greatest mind of early America, Jonathan Edwards, saying that God's purpose for my life was that I have a passion for God's glory and that I have a passion for my joy in that glory, and that these two are one passion.
When I saw this, I knew, at last, what a wasted life would be and how to avoid it..."
John Piper, Don't Waste Your Life