There are verses about how no one can change God’s purposes.
“I know that you can do all things, and that no purpose of yours can be thwarted.Job 42:2
For the LORD of hosts has purposed, and who will annul it? His hand is stretched out, and who will turn it back?Isaiah 14:27
Except people can change God’s plans. God’s people pray and God’s plans change. God says, “I am going to destroy them.” Moses says, “Don’t do it.” God says, “Okay, I won’t.” Those plans changed. God says that His people Israel will stay in the land and be blessed. They get kicked out. The plans changed because of their sin. God’s plans change. That can’t be the same as His will.
God is not fickle. He is who He is. He’s consistent and trustworthy. God is single-minded. He doesn’t have a handful of wills. The Lord is God; the Lord is one. He is of one mind.
So what is His will? His will is His heart, what He desires. His will is mercy, compassion, love, justice, righteousness. His unchanging character shows us His unchanging will. His will is to show us mercy and He will whenever He can, but His will is also righteousness and justice. He can’t do the wrong thing; He can only do the right thing.
The things like healing, the “sozo”-salvation, are all a result of God acting according to His will. He acts in compassion and goodness towards us. He has spoken blessings and curses. He will carry them out. Jesus was perfect but was killed by His enemies. We have to always remember that God’s ways look different than ours. But Jesus triumphed over His enemies. He knew His enemies were not flesh and blood but principalities and powers and He triumphed over them (Col. 2:15).
God’s unchanging will is that He desires all to be saved and all to come to repentance. That’s His will. That’s His heart that will never change. And it’s His unchanging will that He be truthful. He cannot lie. His word is true. He’s given promises, and He will fulfill them. God is true and faithful. That’s another aspect of His character, His unchanging character that we can call His unchanging will. His will has many facets. He’s a big God, an infinite God! His will encompasses all He is. He will never act outside of His will, but He will hold it all in perfect balance, the love, compassion, mercy, and grace and the holiness, justice, wrath, and righteousness.
We see in nature how all things hold in balance. It’s called homeostasis. We see it in everything. God knows how to hold on and release, say yes and no, speak and be silent. He can do all things perfectly at all times.
God acts for the good of His children and for His glory. We can be sure of these things because God’s will is unchanging. He is loving, faithful, and true. We can trust Him and how He will act toward us and in the world. The fear of the Lord is a real thing, but for a child of God, it leads us to revel in His magnificence and the glory of one who does ALL things well.