Kural - 618

'Tis no reproach unpropitious fate should ban;
But not to do man's work is foul disgrace to man

Explanation
Adverse fate is no disgrace to any one; to be without exertion and without knowing what should be known, is disgrace.

Tamil Transliteration
Poriyinmai Yaarkkum Pazhiyandru Arivarindhu
Aalvinai Inmai Pazhi.