अनुद्वेगकरं वाक्यं सत्यं प्रियहितं च यत्।
स्वाध्यायाभ्यसनं चैव वाङ्मयं तप उच्यते।।17.15।।
।।17.15।।उद्वेग न करनेवाला? सत्य? प्रिय? हितकारक भाषण तथा स्वाध्याय और अभ्यास करना -- यह वाणीसम्बन्धी तप कहा जाता है।
Lord Krishna states that what is known as austerity of speech is svadhaya or the recitation of Vedic mantras after first being duly initiated by the Vaisnava spiritual master. Words which consist totally of truth yet do not offend those spoken to and which are imbued with sweet and pleasing words that are inspiring and beneficial are austerities of speech in sattva guna the mode of goodness.