Kautilya's Arthashastra 8.3.26

8.3.26

duruktaśalyaṃ hṛdi nikhātaṃ tejaḥsaṃdīpanam indriyopatāpi ca" iti //

Visáláksha says that of abuse of language and of money, abuse of language is worse; for when harshly spoken to, a brave man retaliates; and bad language, like a nail piercing the heart, excites anger and gives pain to the senses.