James 3:2-4

2For we all stumble in many ways. If anyone does not stumble in what he says, he is mature, able also to control the whole body.

3Now if we put bits into the mouths of horses so that they obey us, we direct their whole bodies.

4And consider ships: Though very large and driven by fierce winds, they are guided by a very small rudder wherever the will of the pilot directs.