James 3:3-8

Now if we put bits into the horses’ mouths to make them obey us, we guide their whole body as well. And look at the ships. Even though they are so large and are driven by strong winds, they are still directed by a very small rudder wherever the impulse of the helmsman determines. In the same sense, the tongue is a small part of the body, and yet it boasts of great things. S ee [by comparison] how great a forest is set on fire by a small spark! And the tongue is [in a sense] a fire, the very world of injustice and unrighteousness; the tongue is set among our members as that which contaminates the entire body, and sets on fire the course of our life [the cycle of man’s existence], and is itself set on fire by hell (Gehenna). For every species of beasts and birds, of reptiles and sea creatures, is tamed and has been tamed by the human race. But no one can tame the human tongue; it is a restless evil [undisciplined, unstable], full of deadly poison.