Thirukkural

தொகச்சொல்லித் தூவாத நீக்கி நகச்சொல்லி நன்றி பயப்பதாந் தூது.

Thokach Chollith Thoovaadha Neekki Nakachcholli Nandri Payappadhaan Thoodhu

He is an ambassador who (in the presence of foreign rulers) speaks briefly, avoids harshness, talks so as to make them smile, and thus brings good (to his own sovereign)