Kural - 858

'Tis gain to turn the soul from enmity;
Ruin reigns where this hath mastery

Explanation
Shrinking back from hatred will yield wealth; indulging in its increase will hasten ruin.

Tamil Transliteration
Ikalirku Edhirsaaidhal Aakkam Adhanai
Mikalookkin Ookkumaam Ketu.