James 3:1-6 RSV

1 Let not many of you become teachers, my brethren, for you know that we who teach shall be judged with greater strictness.
2 For we all make many mistakes, and if any one makes no mistakes in what he says he is a perfect man, able to bridle the whole body also.
3 If we put bits into the mouths of horses that they may obey us, we guide their whole bodies.
4 Look at the ships also; though they are so great and are driven by strong winds, they are guided by a very small rudder wherever the will of the pilot directs.
5 So the tongue is a little member and boasts of great things. How great a forest is set ablaze by a small fire!
6 And the tongue is a fire. The tongue is an unrighteous world among our members, staining the whole body, setting on fire the cycle of nature, and set on fire by hell.