Kural - 204

Though good thy soul forget, plot not thy neighbour's fall,
Thy plans shall 'virtue's Power' by ruin to thyself forestall

Explanation
Even though forgetfulness meditate not the ruin of another Virtue will meditate the ruin of him who thus meditates.

Tamil Transliteration
Marandhum Piranketu Soozharka Soozhin
Aranjoozham Soozhndhavan Ketu.