James 3:3-6

Now if we put bits into the mouths of horses so that they obey us, we direct their whole bodies. And consider ships: Though very large and driven by fierce winds, they are guided by a very small rudder wherever the will of the pilot directs. So too, though the tongue is a small part of the body, it boasts great things. Consider how a small fire sets ablaze a large forest. And the tongue is a fire. The tongue, a world of unrighteousness, is placed among our members. It stains the whole body, sets the course of life on fire, and is itself set on fire by hell.