Mere Christianity Book IV Chapter 9 ("Counting the cost") : George MacDonald References

In C.S. Lewis's book [Mere Christianity](https://www.harpercollins.com/products/mere-christianity-c-s-lewis?variant=32123686027298) , Book Four, Chapter 9 ("Counting the cost") there are 2 illustrations that C.S. Lewis borrowed from George MacDonald. The first: > And yet—this is the other and equally important side of it— this Helper who will, in the long run, be satisfied with nothing less than absolute perfection, will also be delighted with the first feeble, stumbling effort you make tomorrow to do the simplest duty. As a great Christian writer (George MacDonald) pointed out, every father is pleased at the baby’s first attempt to walk: no father would be satisfied with anything less than a firm, free, manly walk in a grown-up son. In the same way, he said, ‘God is easy to please, but hard to satisfy.’ The second: > I find I must borrow yet another parable from George MacDonald. 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 new wing here, putting on 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. The question: **Which books / sermons / stories by George MacDonald do these references coming from?**