To many men well-fitting doors are not set on their tongues.
The wise hand doth not all that the foolish mouth speakes. [The wise hand doth not all that the foolish mouth speaks.]
He has no control over his mouth. He will say anything that flits across his frontal lobe.
People who know other people’s secrets can’t afford to do things that impair their ability to control their mouths.
At the end of the day, all I can do is control me and what comes out of my mouth.
I need to control my mouth.
Be not thy tongue thy own shame's orator.