The same thing is true for ships. They are very big and are driven by strong winds. Yet, by using small rudders, pilots steer ships wherever they want them to go.
“My Father has turned everything over to me. Only the Father knows the Son. And no one knows the Father except the Son and those to whom the Son is willing to reveal him.
In the same way the tongue is a small part of the body, but it can brag about doing important things. A large forest can be set on fire by a little flame.