A good man produces good out of the good storeroom of his heart. An evil man produces evil out of the evil storeroom, for his mouth speaks from the overflow of the heart.
Not only are our actions spiritual fruit but also our words are spiritual fruit. We produce either good or bad fruit based on the overflow of our hearts which is evidenced in our speaking. Words matter. Watch your mouth!
Set a guard, O Lord, over my mouth;
Keep watch over the door of my lips.