Shmiras Halashon (guarding the tongue) is a practice in Judaism that is said to promote the quality of life and help combat and reduce Lashon Hara (evil tongue).
King David once said, "He who loves life and would like to see good days, let him guard his tongue from evil and his lips from speaking deceit.
The concepts and practice of Shmiras Halashon are found all through ancient Jewish writings, the modern practice was birthed and popularised by Rabbi Yisrael Meir Kagan (Chofetz Chaim).
[3] Keeping these commandments increases happiness and quality of life while carelessness causes destruction.
The concept of guarding one's tongue works in a family or corporate setting and increases peace and happiness.