James 3:3-5

Amplified Bible

³ Now if we put bits into the horses’ mouths to make them obey us, we guide their whole body as well. ⁴ 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. ⁵ In the same sense, the tongue is a small part of the body, and yet it boasts of great things.

See [by comparison] how great a forest is set on fire by a small spark!