Kural - 111

If justice, failing not, its quality maintain,
Giving to each his due, -'tis man's one highest gain

Explanation
That equity which consists in acting with equal regard to each of (the three) divisions of men [enemies, strangers and friends] is a pre-eminent virtue.

Tamil Transliteration
Thakudhi Enavondru Nandre Pakudhiyaal
Paarpattu Ozhukap Perin.