We all make many mistakes. If there were a person who never said anything wrong, then that person would be perfect. A person like that would be able to control their whole body, too.
It is the same with ships. A ship is very big, and it is pushed by strong winds. But a very small rudder controls that big ship. The man who controls the rudder decides where the ship will go. The ship goes where the man wants.
It is the same with our tongue. It is a small part of the body, but it boasts about doing great things. A big forest fire can be started with only a little flame.
The tongue is like a fire. It is a world of evil among the parts of our body. How? The tongue spreads its evil through our whole body. It starts a fire that influences all of life. The tongue gets this fire from hell.