James 3 is all about the power of the tongue. It starts by saying that no one can tame the tongue, and it can do more damage than any other part of the body. It then goes on to say that too much talk makes people sound like a bunch of fools, and it's better to keep quiet if you can't say anything nice. The chapter also talks about how we should not be hypocritical and use our tongues to praise God, but then use them to criticize others. To sum it up: if you don't have anything nice to say, don't say anything at all. That's what James 3 is all about.