Kural - 721

Men, pure in heart, who know of words the varied force,
The mighty council's moods discern, nor fail in their discourse

Explanation
The pure who know the classification of words having first ascertained the nature (of the court) will not (through fear) falter in their speech before the powerful body.

Tamil Transliteration
Vakaiyarindhu Vallavai Vaaisoraar Sollin
Thokaiyarindha Thooimai Yavar.