One should not hurt others by words. One must not speak even an unpleasant truth unnecessarily. By indulging in rude words, one’s nature becomes coarse. One’s sensibility is lost if one has no control over one’s speech.
If you want peace of mind, do not find faults with others. Rather see your own faults. Learn to make the whole world your own. No one is a stranger. The whole world is your own.
(Source: Eternal Values, Swami Lokeshwarananda, The Ramakrishna Mission Institute of Culture, Calcutta, 19)