Romans 9:14-18

So what should we say about this? Is God unfair? In no way. God said to Moses, “I will show kindness to anyone to whom I want to show kindness, and I will show mercy to anyone to whom I want to show mercy.” So God will choose the one to whom he decides to show mercy; his choice does not depend on what people want or try to do. The Scripture says to the king of Egypt: “I made you king for this reason: to show my power in you so that my name will be talked about in all the earth.” So God shows mercy where he wants to show mercy, and he makes stubborn the people he wants to make stubborn.