Kural - 861

With stronger than thyself, turn from the strife away;
With weaker shun not, rather court the fray

Explanation
Avoid offering resistance to the strong; (but) never fail to cherish enmity towards the weak.

Tamil Transliteration
Valiyaarkku Maaretral Ompuka Ompaa
Meliyaarmel Meka Pakai.