Kural - 687

He is the best who knows what's due, the time considered well,
The place selects, then ponders long ere he his errand tell

Explanation
He is chief (among ambassadors) who understands the proper decorum (before foreign princes), seeks the (proper) occasion, knows the (most suitable) place, and delivers his message after (due).

Tamil Transliteration
Katanarindhu Kaalang Karudhi Itanarindhu
Enni Uraippaan Thalai.