Matthew 12:33-35

“If you want good fruit, you must make the tree good. If your tree is not good, it will have bad fruit. A tree is known by the kind of fruit it produces. You snakes! You are evil people, so how can you say anything good? The mouth speaks the things that are in the heart. Good people have good things in their hearts, and so they say good things. But evil people have evil in their hearts, so they say evil things.