anudvega-karam vakyam
satyam priya-hitam ca yat
svadhyayabhyasanam caiva
van-mayam tapa ucyate
anudveganot agitating; karamproducing; vakyamwords; satyamtruthful; priyadear; hitambeneficial; caalso; yatwhich; svadhyayaVedic study; abhyasanampractice; caalso; evacertainly; vanmayamof the voice; tapahausterity; ucyateis said to be.
Austerity of speech consists in speaking truthfully and beneficially and in avoiding speech that offends. One should also recite the Vedas regularly.
One should not speak in such a way as to agitate the minds of others. Of course, when a teacher speaks, he can speak the truth for the instruction of his students, but such a teacher should not speak to others who are not his students if he will agitate their minds. This is penance as far as talking is concerned. Besides that, one should not talk nonsense. When speaking in spiritual circles, one's statements must be upheld by the scriptures. One should at once quote from scriptural authority to back up what he is saying. At the same time, such talk should be very pleasurable to the ear. By such discussions, one may derive the highest benefit and elevate human society. There is a limitless stock of Vedic literature, and one should study this. This is called penance of speech.

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