Kural - 538

Let things that merit praise thy watchful soul employ;
Who these despise attain through sevenfold births no joy

Explanation
Let (a man) observe and do these things which have been praised (by the wise); if he neglects and fails to perform them, for him there will be no (happiness) throughout the seven births.

Tamil Transliteration
Pukazhndhavai Potrich Cheyalventum Seyyaadhu
Ikazhndhaarkku Ezhumaiyum Il.