Kural - 567

Harsh words and punishments severe beyond the right,
Are file that wears away the monarch's conquering might

Explanation
Severe words and excessive punishments will be a file to waste away a king's power for destroying (his enemies).

Tamil Transliteration
Katumozhiyum Kaiyikandha Thantamum Vendhan
Atumuran Theykkum Aram.