Philippians 2:12-13

Do all things without murmuring and disputing, that you may be blameless and harmless, sons of God, without fault, in the midst of a crooked and perverse generation, in which you shine as lights in the world.  

The struggle is real to try and keep the mouth from speaking when frustrated or angry.  Sometimes, we want to vent and complain, and we will feel better, but we don’t.  The problem becomes more extensive in our minds than if we would have just said nothing.  Light has a switch on and off, and negative speaking shuts off our light.