Mere Christianity by C.S. Lewis

This is a book written by the same author of the Narnia chronicles. Here are a couple of excerpts that really struck a cord because we are all relatively new christians who used to be either ignorant or hard-hearted so if you ever find it in a bookstore, I hope you'll pick it up like I did. ;-P

"Now Faith...is the art of holding on to things your reason 'has once accepted, in spite of your changing moods. For moods will change, whatever view your reason takes. I know that by experience. Now that I am a Christian I do have moods in which the whole thing looks very improbable: but when I was an atheist I had moods in which Christianity looked terribly probable. This rebellion of your moods against your real self is going to come anyway. That is why Faith is such a necessary virtue: unless you teach your moods where they get off, you can never be either a sound Christian or even a sound atheist, but just a creature dithering to and fro, with its beliefs really dependent on the weather and the state of its digestion. Consequently one must train the habit of Faith."

"My argument against God was that the universe seemed so cruel and unjust. But how had I got this idea of just and unjust? A man does not call a line crooked unless he has some idea of a straight line. What was I comparing this universe with when I called it unjust? If the whole show was bad and senseless from A to Z, so to speak, why did I, who was supposed to be part of the show, find myself in such violent reaction against it? A man feels wet when he falls into water, because man is not a water animal: a fish would not feel wet. Of course, I could have given up my idea of justice by saying that it was nothing but a private idea of my own. But if I did that, then my argument against God collapsed too--for the argument depended on saying that the world was really unjust, not simply that it did not happen to please my private fancies. Thus in the very act of trying to prove that God did not exist--in other words, that the whole of reality was senseless--I found I was forced to assume that one part of reality--namely my idea of justice--was full of sense. Consequently atheism turns out to be too simple. If the whole universe has no meaning, we should never have found out that it has no meaning: just as, if there were no light in the universe and therefore no creatures with eyes, we should never know it was dark. Dark would be without meaning."