Kural - 981

All goodly things are duties to the men, they say
Who set themselves to walk in virtue's perfect way

Explanation
It is said that those who are conscious of their duty and behave with a perfect goodness will regard as natural all that is good.

Tamil Transliteration
Katanenpa Nallavai Ellaam Katanarindhu
Saandraanmai Merkol Pavarkku.