Exodus 11:9-10
The Lord had said to Moses, “Pharaoh will refuse to listen to you—so that my wonders may be multiplied in Egypt.” Moses and Aaron performed all these wonders before Pharaoh, but the Lord hardened Pharaoh’s heart, and he would not let the Israelites go out of his country.//
Sometimes the Lord lets people refuse to believe Him, so that a multitude of people will see His wonders.