Kural - 684

Sense, goodly grace, and knowledge exquisite
Who hath these three for envoy's task is fit

Explanation
He may go on a mission (to foreign rulers) who has combined in him all these three viz, (natural) sense, an attractive bearing and well-tried learning.

Tamil Transliteration
Arivuru Vaaraaindha Kalviim Moondran
Serivutaiyaan Selka Vinaikku.