Kural - 852

Though men disunion plan, and do thee much despite
'Tis best no enmity to plan, nor evil deeds requite

Explanation
Though disagreeable things may be done from (a feeling of) disunion, it is far better that nothing painful be done from (that of) hatred.

Tamil Transliteration
Pakalkarudhip Patraa Seyinum Ikalkarudhi
Innaasey Yaamai Thalai.