James 3:1-3

Do not become teachers in large numbers, my brothers, since you know that we who are teachers will incur a stricter judgment.

For we all stumble in many ways. If anyone does not stumble in what he says, he is a perfect man, able to rein in the whole body as well.

Now if we put the bits into the horses’ mouths so that they will obey us, we direct their whole body as well.