 And that's what he's getting at in verse 23. All these evil things come from within. This is what defiles a man. Thus, what needs to happen? That's what's sitting in our heart. If the heart is the issue, then what do we need? We need a renovation of the heart. A transformation of the heart. In the Old Testament, we're given some insight into the heart. Jeremiah would write this. Listen to what he says in Jeremiah 17, 9. The heart is deceitful above all things.