अनुद्वेगकरं वाक्यं सत्यं प्रियहितं च यत् ।
स्वाध्यायाभ्यसनं चैव वाङ्मयं तप उच्यते ॥
१७-१५ ॥
anudvegakaraṃ vākyaṃ satyaṃ priyahitaṃ ca yat |
svādhyāyābhyasanaṃ caiva vāṅmayaṃ tapa ucyate ||
17-15 ||
Speech that causes no agitation, that is truthful, pleasant, and beneficial, together with the regular practice of reciting scripture — this is called the austerity of speech.