Look at ships as well: even though they're very big and are driven along by strong winds, they're steered by a very small rudder in the direction the pilot wants to go.
Everything has been entrusted to me by my Father, and no one really understands the Son, except the Father, and no one really understands the Father, except the Son, and those to whom the Son chooses to reveal him.
In just the same way the tongue is a very small part of the body, but it makes great boasts! Think how a big forest can be set on fire by a very small flame!