James 3:5-8
So also the tongue is a small part of the body, and yet it boasts of great things. See how great a forest is set aflame by such a small fire! 6 And the tongue is a fire, the very world of iniquity; the tongue is set among our members as that which defiles the entire body, and sets on fire the course of our life, and is set on fire by hell. 7 For every species of beasts and birds, of reptiles and creatures of the sea, is tamed and has been tamed by the human race. 8 But no one can tame the tongue; it is a restless evil and full of deadly poison.