अनुद्वेगकरं वाक्यं सत्यं प्रियहितं च यत् |\nस्वाध्यायाभ्यसनं चैव वाङ्मयं तप उच्यते ||१७-१५||
anudvegakaraṃ vākyaṃ satyaṃ priyahitaṃ ca yat .\nsvādhyāyābhyasanaṃ caiva vāṅmayaṃ tapa ucyate ||17-15||
Words that do not cause distress, are truthful, inoffensive, and beneficial, as well as regular recitation of the Vedic scriptures—these are declared as austerity of speech.