Kural - 883

Of hidden hate beware, and guard thy life;
In troublous time 'twill deeper wound than potter's knife

Explanation
Fear internal enmity and guard yourself; (if not) it will destroy (you) in an evil hour, as surely as the tool which cuts the potter's clay.

Tamil Transliteration
Utpakai Anjiththar Kaakka Ulaivitaththu
Matpakaiyin Maanath Therum.