James 3:5-6, 8-9

So also the tongue certainly is a small part, but it moves great things. Consider that a small fire can set ablaze a great forest. And so the tongue is like a fire, comprising all iniquity. The tongue, stationed in the midst of our body, can defile the entire body and inflame the wheel of our nativity, setting a fire from Hell.

But no man is able to rule over the tongue, a restless evil, full of deadly poison. By it we bless God the Father, and by it we speak evil of men, who have been made in the likeness of God.