Mbh 12.300.4a

"'"The Swan said, 'Ye who have drunk Amrita, I have heard that one should have recourse to these, viz., penances, self-restraint, truth, and subjugation of the mind. Untying all the knots of the heart, one should also bring under one's control both what is agreeable and what is disagreeable.[1576] One should not wound the vitals of others. One should not be an utterer of cruel speeches. One should never take scriptural lectures from a person that is mean. One should never utter such words as inflict pain on others, as cause others to burn (with misery), and as lead to hell. Wordy shafts fall from the lips. Pierced therewith one (to whom they are directed) burns incessantly. Those shafts do not strike any part other than the very vitals of the person aimed. Hence he that is possessed of learning should never aim them at others. If a person deeply pierces a man of wisdom with wordy shafts, the wise man should then adopt peace (without giving way to wrath). The man who, though sought to be angered, rejoices without yielding to anger, taketh away from the provoker all his merits. That man of righteous soul, who, full of joy and freed from malice, subdues his blazing wrath which, if indulged, would lead him to speak ill of others and verily become his foe, takes away the merits of others. As regards myself, I never answer when another speaks ill of me. If assailed, I always forgive the assault. The righteous are of opinion that forgiveness and truth and sincerity and compassion are the foremost (of all virtues). Truth is the arcanum of the Vedas. The arcanum of Truth is self-restraint. The arcanum of self-restraint is Emancipation. This is the teaching of all the scriptures. I regard that person to be Brahmana and Muni who subjugates the rising impulse of speech, the impulse of wrath appearing in the mind, the impulse of thirst (after unworthy things), and the impulses of the stomach and the organ of pleasure. One who does not yield to wrath is superior to one who does.