Speech which causes no excitement, and is truthful, pleasant and beneficial, and the practice of the study of the VEDAS, these constitute the austerity of speech.

anudvegakaraṃ = not agitating; vākyaṃ = words; satyaṃ = truthful; priya = dear; hitaṃ = beneficial; ca = also; yat = which; svādhyāya = of Vedic study; abhyasanaṃ = practice; ca = also; eva = certainly; vāṅmayaṃ = of the voice; tapaḥ = austerity; ucyate = is said to be.;