Luke 6:43-45

43Jesus said, ‘Good trees only make good fruit. Bad trees only make bad fruit.

44In this way you can know if a tree is good or bad. You can know this by the fruit that the tree makes. Figs and grapes do not grow on thorn bushes.

45People are also like that. A good man keeps good things in his mind. In his life, he brings those good things out from there. But a bad man keeps bad things in his mind. He brings those bad thoughts out from there. When a person speaks, his words show what is really in his mind.’