A yogi is much more disciplined in his speech. Yogic tradition has it that speech must pass before three barriers prior to being uttered aloud. These barriers come in the form of three questions: Is it kind? Is it true? Is it necessary? (112-113)
It [speaking with words that bring about harmony] consists of speaking of what is good about people, instead of what is wrong with them. For some people this is an almost impossible exercise, for they have become totally habituated to speaking critically. We all seem to have a special talent for finding critical things to say about the world, about others, and about ourselves! (117)