What does this moral law tell us about God?

I ended my last chapter with the idea that in the Moral Law somebody or something from beyond the material universe was actually getting at us. And I expect when I reached that point some of you felt a certain annoyance. You may even have thought that I had played a trick on you—that I had been carefully wrapping up to look like philosophy what turns out
to be one more ‘religious jaw’…. [T]his has not yet turned exactly into a ‘religious jaw’. We have not yet got as far as the God of any actual religion, still less the God of that particular religion called Christianity. We have only got as far as a Somebody or Something behind the Moral Law. We are not taking anything from the Bible or the Churches, we are trying to see what we can find out about this Somebody on our own steam. And I want to make it quite clear that what we find out on our own steam is something that gives us a shock. We have two bits of evidence about the Somebody.  One is the universe He has made. If we used that as our only clue, then I think we should have to conclude that He was a great artist (for the universe is a very beautiful place), but also that He is quite merciless and no friend to man (for the universe is a very dangerous and terrifying place). The other bit of evidence is that Moral Law which He has put into our minds. And this is a better bit of evidence than the other, because it is inside information. You find out more about God from the Moral Law than from the universe in general just as you find out more about a man by listening to his conversation than by looking at a house he has built. Now, from this second bit of evidence we conclude that the Being behind the universe is intensely interested in right conduct—in fair play, unselfishness, courage, good faith, honesty and truthfulness. In that sense we should agree with the account given by Christianity and some other religions, that God is ‘good’. But do not let us go too fast here.

Quotes from Mere Christianity, Part 11
C.S. Lewis, Mere Christianity (1952, this edition: 2001) 28, 29-30.

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