The tongue has the power of life and death, and those who love it will eat its fruit.

The words of a man's mouth are deep waters, but the fountain of wisdom is a bubbling brook.

A fool's lips bring him strife, and his mouth invites a beating.

 A fool's mouth is his undoing, and his lips are a snare to his soul.

The words of a gossip are like choice morsels; they go down to a man's inmost parts.
He who answers before listening—  that is his folly and his shame.

From the fruit of his mouth a man's stomach is filled; with the harvest from his lips he is satisfied.

Those are all verses from one chapter in proverbs, and they are all talking about your mouth. It says the tongue has the power over life and death! It seems a lot of these verses are about what happens when you speak foolishly or speak before listening. If you con keep control of your tongue. that'd save you from a lot of trouble according to this proverb.