"Observe and hear all these words which I command thee, that it may go well with thee, and with thy children after thee for ever, when thou doest that which is good and right in the sight of the Lord thy God." --Deut. 15: 4 KJV
See that you are SPEAKING with words that are good and right!
"You'll find that you can't just speak what you're thinking, if it is not good or right" Is this where think before you speak came from? Hmmm? And some people think they can say anything because it's their mouth... Ha!