Thirukkural 779

இழைத்தது இகவாமைச் சாவாரை யாரே பிழைத்தது ஒறுக்கிற் பவர்.

Izhaiththu ikavāmaiç chāvārai yāre Pizhaiththu orukkir pavur

Who can punish a man who has done wrong and refuses to acknowledge it? Only he who has the strength to face his own faults.