The Great Epic of the Bhārata dynasty 12.208.8

12.208.8

tasmātsamāhitaṃ buddhyā mano bhūteṣu dhārayet |
nāpadhyāyenna spṛhayennābaddhaṃ cintayedasat || 8 ||

That man who regards the practice of the virtues enumerated above as the highest duty, as conducive to the happiness of all creatures, and as destructive of all kinds of sorrow, is possessed of the highest knowledge, and succeeds in obtaining happiness. Hence (as already said), one should, exercising one's intelligence, dispose one's mind, after training it, on peace towards all creatures. One should never think of doing evil to others. One should not covet what is far above one's power to attain. One should not turn one's thoughts towards objects that are non-existent. One should, on the other hand, direct one's mind towards knowledge by such persistent efforts as are sure to succeed. With the aid of the declarations of the Srutis and of persistent efforts calculated to bring success, that Knowledge is sure to flow. One that is desirous of saying good words or observing a religion that is refined of all dross, should utter only truth that is not fraught with any malice or censure. One that is possessed of a sound heart should utter words that are not fraught with dishonesty, that are not harsh, that are not cruel, that are not evil, and that are not characterised by garrulity. The universe is bound in speech. If disposed to renunciation (of all worldly objects) then should one proclaim, which a mind fraught with humility and a cleansed understanding, one's own evil acts.