Rob Stiles (@robstiles1) is a good follow on Twitter. He recently posted a list from Monergism.org of 75 Best Sermons. This is the first sermon from the list by Kevin DeYoung. The first thing you need to know is what the word immutable means. It means that God does not change, which can be either very good news or really bad news for you.
God is immutable and does not change. Even though we may imagine and think that God should change His impossible and holy standard of perfect righteousness for us to get into heaven, we cannot expect Him to grade on a curve for He does not change. He does not change and His promises and His Word to us are good and a firm foundation. Our God is holy. He is separate and distinct--He is constant and perfectly consistent, not like us.
We are in a world that is in constant change. DeYoung says in our souls, we are "mutability searching for immutability," and, "The only to overcome the constant change in your life and in your self and in your world is to know the One whose essence and knowledge and will never changes." One theologian said the immutability of God is the "fulcrum of our faith and the foundation of our hope."
You can download the audio link here. I have found it helpful to listen to these to and from work.