Stubborn people in the bible: I will harden Pharaoh's heart, and though I multiply my signs and wonders in Egypt

The Bible teaches us the danger of having a stubborn heart towards error. The hardness of the heart is a disorder or spiritual suffering of the soul that prevents us from seeing the truth and treating others as they really are, brothers and sons of God like us. A person with a hardened heart lacks the flexibility of thought and is sustained by "fixed or immovable ideas", distrusts others, and suspects betrayal by insignificant situations. When they rule they become true tyrants, the tyrant according to Aristotle is the opposite figure of the king.
The Bible tells us how the figure of the prophet Moses is opposed to the pharaoh in the book of Exodus. God sends Moses and Aaron to see Pharaoh with a divine mission, to free the Israelites from the slavery to which they were subjected. But God warns them that they will be put to the test because Pharaoh's heart is hardened and he does not understand reasons. God with this is telling us that the difficulties of life are to teach us and test our temperament as when a sword is forged in a blacksmith's workshop.
This is how the Bible tells us how God prophesies to Moses that he will do great signs and prodigies that will demonstrate God's judgment on the people of Egypt in the face of a stubborn pharaoh who defies God:
"Then the LORD said to Moses, ´See, I have made you like God to Pharaoh, and your brother Aaron will be your prophet. You are to say everything I command you, and your brother Aaron is to pell Pharaoh to let the Israelites go out of his country. But I will harden Pharaoh's heart, and though I multiply my signs and wonders in Egypt, he will not listen to you. Then I will lay hand on Egypt and with mighty acts of judgment I will bring out my divisions, my people the Israelites. And the Egyptians will know that I am the LORD when I stretch out my hand against Egypt and bring the Israelites out of it" Exodus 7:1-5.

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