Kural - 628

He seeks not joy, to sorrow man is born, he knows;
Such man will walk unharmed by touch of human woes

Explanation
That man never experiences sorrow, who does not seek for pleasure, and who considers distress to be natural (to man).

Tamil Transliteration
Inpam Vizhaiyaan Itumpai Iyalpenpaan
Thunpam Urudhal Ilan.