Romans 9:17, 22

For just as God said to Pharaoh: “I raised you up as ruler of Egypt for this reason, that I might make you an example of how I demonstrate my miracle power. For by the example of how I deal with you, my powerful name will be a message proclaimed throughout the earth!”

And in the same way, although God has every right to unleash his anger and demonstrate his power, yet he is extremely patient with those who deserve wrath—vessels prepared for destruction.