Kural - 504

Weigh well the good of each, his failings closely scan,
As these or those prevail, so estimate the man

Explanation
Let (a king) consider (a man's) good qualities, as well as his faults, and then judge (of his character) by that which prevails.

Tamil Transliteration
Kunamnaatik Kutramum Naati Avatrul
Mikainaati Mikka Kolal.