Good people produce what's good from the good things they value that they have stored inside them. Bad people produce what's bad from the bad things they have stored inside them. What fills people's minds spills out in what they say.
“Food for the stomach, and the stomach for food”—but God will destroy both of them. Also, the body is not meant to be used for immorality, but for the Lord, and the Lord for the body.
And the tongue is a fire! The tongue is a world of evil among the parts of the body. It disgraces all you are as a person, and can burn down the whole of your life, since it is set on fire by Gehenna.