Matthew 12:33-37

Either make the tree good and its fruit good, or else make the tree corrupt and its fruit corrupt; for the tree is known by its fruit. O generation of vipers, how can ye, being evil, speak good things? For out of the abundance of the heart the mouth speaks. The good man out of the good treasure of the heart brings forth good things, and the evil man out of the evil treasure brings forth evil things. But I say unto you, That every idle word that men shall speak, they shall give account thereof in the day of judgment. For by thy words thou shalt be justified, and by thy words thou shalt be condemned.