If anybody hasn't figured it out yet, C.S. Lewis is one of my favorite Christian writers. And this passage has resonated with me, probably because I've made my living for years working on houses. He admitted he borrowed the idea from George MacDonald; I've never read enough of MacDonald's stuff to find the original reference. Here's Lewis' take:
"Imagine yourself as a living house. God comes in to rebuild that house. At first, perhaps, you can understand what He is doing. He is getting the drains right and stopping the leaks in the roof and so on; you knew that those jobs needed doing and so you are not surprised. But presently he starts knocking the house about in a way that hurts abominably and does not seem to make sense. What on earth is He up to? The explanation is that He is building quite a different house from the one you thought of--throwing out a wing here, putting up an extra floor there, running up towers, making courtyards. You thought you were going to be made into a decent little cottage; but He is building a palace. He intends to come and live in it Himself." "Mere Christianity", p.205
My life has had a lot of unexpected changes and turnings compared to where I was, say 40 years ago. But I've learned to trust the Architect, and I have no wish to go back to my own original plans.