James 3:3-5

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!