From post 213
Did you read this ?
God could change things through intervention, that does not mean that there is any change within the nature of God, because
he knew from all eternity that he would create the world and save it from its sins.
In one sense everything is seen and done by God from all eternity. There is no change here. But from the viewpoint of creatures in the world there is change and improvement. Now if God were finite, there would have to be a change in him when he worked changes in the world. In that case God could not be perfect, changeless, immutable. But God is infinite, a nature that we cannot comprehend… Perhaps another way to look at it is this. God is Being or Existence Itself and therefore absolutely complete.
God Bless