Luke 6:43-45

43No good tree bears bad fruit, nor does a bad tree bear good fruit. 44For each tree is known by its own fruit. Indeed, figs are not gathered from thornbushes, nor grapes from brambles. 45The good man brings good things out of the good treasure of his heart, and the evil man brings evil things out of the evil treasure of his heart. For out of the overflow of the heart the mouth speaks.