Mbh 12.84.3

"'"Vrihaspati said, 'Agreeableness of speech, O Sakra, is the one thing by practising which a person may become an object of regard with all creatures and acquire great celebrity. This is the one thing, O Sakra, which gives happiness to all. By practising it, one may always obtain the love of all creatures. The person who does not speak a word and whose face is always furrowed with frowns, becomes an object of hatred with all creatures. Abstention from agreeable speeches makes him so. That person who, upon beholding others, addresses them first and does so with smiles succeeds in making everyone gratified with him. Even gifts, if not made with agreeable speeches, do not delight the recipients, like rice without curry. If even the possessions of men, O Sakra, be taken away with sweet speeches, such sweetness of behaviour succeeds in reconciling the robbed. A king, therefore, that is desirous of even inflicting chastisement should utter sweet words. Sweetness of speech never fails of its purpose, while, at the same time it never pains any heart. A person of good acts and good, agreeable, and sweet speeches, has no equal.'"