"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 any 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 new wing here, putting on an extra floor there, running up towers, making courtyards. You thought you were being made into a decent little cottage: but He is building a palace. He intends to come and live in it Himself."
We're here on this earth to learn faith, and we wouldn't be able to learn it if we knew the end result of every trial, every adventure, and every choice. We have one idea of what we can become, but our Heavenly Father knows us so much better than we know ourselves. He sees a beautiful palace, while all we can see is a sweet, little cottage. Faith comes in when we let our cottage go, and let him get to work.