Kural - 70

To sire, what best requital can by grateful child be done?
To make men say, 'What merit gained the father such a son?'

Explanation
(So to act) that it may be said "by what great penance did his father beget him," is the benefit which a son should render to his father.

Tamil Transliteration
Makandhandhaikku Aatrum Udhavi Ivandhandhai
Ennotraan Kol Enum Sol.