Kural - 953

The smile, the gift, the pleasant word, unfailing courtesy
These are the signs, they say, of true nobility

Explanation
A cheerful countenance, liberality, pleasant words, and an unreviling disposition, these four are said to be the proper qualities of the truly high-born.

Tamil Transliteration
Nakaieekai Insol Ikazhaamai Naankum
Vakaiyenpa Vaaimaik Kutikku.