Man Or Rabbit?

"Christianity will do you good--a great deal more good than you ever wanted or expected. And the first bit of good it will do you is to hammer into your head (you won't enjoy that!) the fact that what you have hitherto called 'good'--all that about 'leading a decent life' and 'being kind'--isn't quite the magnificent and all-important affair you supposed. It will teach you that in fact you can't be 'good' (not for 24 hours) on your own moral efforts. And then it will teach you that even if you were, you still wouldn't have achieved the purpose for which you were created. Mere morality is not the end of your life. You were made for something quite different than that. . . . Confucius simply didn't know what life is about. The people who keep on asking if they can't lead a decent life without Christ, don't know what life is about. . . .

"Morality is indispensable: but the Divine Life, which gives itself to us and which calls us to be gods, intends for us something in which morality will be swallowed up. We are to be re-made. All the rabbit in us is to disappear--the worried, conscientious, ethical rabbit as well as the cowardly and sensual rabbit. We shall bleed and squeal as the handfuls of fur come out; and then, surprisingly, we shall find underneath it all a thing we have never yet imagined: a real Man, an ageless god, a son of God, strong, radiant, wise, beautiful, and drenched in joy."

--C. S. Lewis, "Man or Rabbit?" in God in the Dock pg. 112

You need to let this sink in. Lewis said Christianity "will teach you that in fact you can't be 'good' (not for 24 hours) on your own moral efforts." I love the phrase "All the rabbit in us will disappear" God is doing something far greater than having us lead a decent life he is changing us to be children of God made like his son.