Careful speech instills in children confidence in the fundamental goodness of the world and other people. They learn to judge others favorably, forming a habit that enhances every relationship in their lives. And they develop the character traits that will equip them for every lifetime endeavor. In place of the illusory power conferred by becoming the source of gossip, the person who guards his speech builds real power. This is the power of self-discipline, the knowledge that one has control over his impulses, that he has the inner strength to restrain himself, measure his words and act in accordance with the highest aspects of himself.
Every person seeks peace.
Everyone wants a harmonious home, pleasant relations with friends and colleagues and a calm, peaceful heart. Our Sages state that peace is the ultimate blessing, the container in which all other blessings are held. Nothing is whole, nothing is perfect unless it is accompanied by peace. That is why many important Jewish prayers end with a request for peace. Careful speech is the means God has given us with which to pursue peace with one another.