Kural - 719

In councils of the good, who speak good things with penetrating power,
In councils of the mean, let them say nought, e'en in oblivious hour

Explanation
Those who are able to speak good things impressively in an assembly of the good should not even forgetfully speak them in that of the low.

Tamil Transliteration
Pullavaiyul Pochchaandhum Sollarka Nallavaiyul
Nankusalach Chollu Vaar.