It's so important to stay quiet in some situations. In other situations think 5 seconds before speaking, and even then choose your words and battles wisely. Silence is not sign of meekness, it is a sign of strength. To be able to hold one's tongue, and not use it against yourself is a powerful personality trait.
Similarly, the masseter is the strongest muscle in the body that is responsible for lifting up the jaw, it should be used for ones protection and not for aggression. When opening your jaw to speak remember what power it holds within... the tongue. The tongue can slice another person's heart and damage their brain with a few simple words, or it can soothe and reassure. Use your tongue today to heal and not hurt.