Malachi 3:6 0 — “For I the LORD do not change; therefore you, O children of Jacob, are not consumed.”
James 1:17 — Every good gift and every perfect gift is from above, coming down from the Father of lights with whom there is no variation or shadow due to change.
Immutable. What does it mean? When something is immutable that means it never changes. Ever. So when we say that God Almighty is immutable, it means that he never changes. He remains constant and faithful to His nature and character.
In God’s immutability lies a great source of comfort for the believer. The fact that God does not change His mind, His characteristics, His plan, or anything else is a security better than any earthly insurance for it guarantees His quality of character and gives security to the believer that if He has saved one of us, that saved person will persevere to the end for God has chosen him and will not change his mind and let that man slip through His fingers into the breach of hell (John 10:28). No, God neither changes His plan, His covenants, His prophecies, nor His justice; this lends greatly to His dependability — “…there is no variation or shadow due to change.”
When God makes a promise or decree, it will certainly happen. This is good news!
This post is adapted from Blue Letter Bible’s Theological FAQs page.