Kural - 424

Wisdom hath use of lucid speech, words that acceptance win,
And subtle sense of other men's discourse takes in

Explanation
To speak so as that the meaning may easily enter the mind of the hearer, and to discern the subtlest thought which may lie hidden in the words of others, this is wisdom.

Tamil Transliteration
Enporula Vaakach Chelachchollith Thaanpirarvaai
Nunporul Kaanpa Tharivu.