Proverbs 13:2-3 “From the fruit of his speech a person eats good things, but the treacherous desire the fruit of violence. The one who guards his words guards his life; whoever is talkative will come to ruin.”
What comes out of your mouth comes from within. Good begets good. A good heart brings forth good speech which brings good outcomes. A bad heart brings forth bad speech and brings rotten results. And sometimes the smartest thing to do is to keep your mouth shut! A wise person knows when to speak and when not to, thereby bringing life and not ruin.