James 3:2-8
2We all stumble in many ways. If anyone is never at fault in what he says, he is a perfect man, able to keep his whole body in check.
3When we put bits into the mouths of horses to make them obey us, we can turn the whole animal. 4Or take ships as an example. Although they are so large and are driven by strong winds, they are steered by a very small rudder wherever the pilot wants to go. 5Likewise the tongue is a small part of the body, but it makes great boasts. Consider what a great forest is set on fire by a small spark. 6The tongue also is a fire, a world of evil among the parts of the body. It corrupts the whole person, sets the whole course of his life on fire, and is itself set on fire by hell.
7All kinds of animals, birds, reptiles and creatures of the sea are being tamed and have been tamed by man, 8but no man can tame the tongue. It is a restless evil, full of deadly poison.