 It's a test. They harden their hearts. He says, do not do that. Why does he say that? Because you can do that. You don't have to harden your heart, but you can harden your heart. Learn from him. He even says in Hebrews 3, verse 12, Beware, brethren, lest there be any of you with an evil heart of unbelief. And what does that do? Departing from the living God. So you're in and there's a departing.