Kural - 132

Searching, duly watching, learning, 'decorum' still we find;
Man's only aid; toiling, guard thou this with watchful mind

Explanation
Let propriety of conduct be laboriously preserved and guarded; though one know and practise and excel in many virtues, that will be an eminent aid.

Tamil Transliteration
Parindhompik Kaakka Ozhukkam Therindhompith
Therinum Aqdhe Thunai.