Pain is never the point of God’s plans, any more than it is the purpose of physical exercise. Never pushing ourselves to the point that it hurts means never improving our health. In and of itself, pain is not good, but it is meaningful. Pain indicates that something is wrong and needs to be addressed. Without pain, we’d never know. In the same way, breaking bad habits of the past requires pushing beyond our comfort levels, through the pain, and onward on the path to full restoration.
The appeal of The Chronicles comes back to a single character. Aslan, the Great Lion, who calls the children into Narnia, plays the central role in each adventure. It’s not exactly correct to call Aslan an “allegory” of Jesus. Lewis might prefer that we instead think of Aslan as Christ transposed into a Narnian key, a Creator and Lord fit for a world primarily inhabited by talking animals.