You may say, “I see that Christianity might be just the thing for people who have had collapses in their lives. But what if I don’t fail in my career and what if I have a great family?” As Augustine said, if there is a God who created you, then the deepest chambers of your soul simply cannot be filled up by anything less. That is how great the human soul is. If Jesus is the Creator-Lord, then by definition nothing could satisfy you like he can, even if you are successful. Even the most successful careers and families cannot give the significance, security, and affirmation that the author of glory and love can.
Everybody has to live for something. Whatever that something is becomes “lord of your life,” whether you think of it that way or not. Jesus is the only Lord who, if you receive him, will fulfill you completely, and if you fail him, will forgive you eternally.
– Timothy Keller, The Reason for God: Belief in an Age of Skepticism(Riverhead Books: New York, 2008), 179.