“If anyone is never at fault in what he says, he is a perfect man, able to keep his whole body in check.” – James 3:2

“bits into the mouths of horses”

“When we put  bits into the mouths of horses to make them obey us, we can turn the whole animal.” – James 3:3

“steered by a very small rudder”

“Or take ships as an example. Although they are so large and are driven by strong winds, they are steered by a very small rudder, wherever the pilot wants to go.” – James 3:4

“Likewise the tongue is a small part of the body, but it makes great boasts.” – James 3:5