We all stumble in many ways. If anyone is never at fault in what he says, he is a perfect man, able to keep his whole body in check.
We're all human beings, and it is true that stumbling is a part of the package. Stumbling with your words is an even bigger part of the package. The "foot-in-mouth disease" has become a major part of that human condition.
If there is a man who is able to never be at fault in what he says... Wow. He has got to be near perfect.