Old Tamil Poetry

Thirukkural – 473

Overrating oneself, unaware of true strength,
and destroyed by the foe, are many.

உடைத் தம் வலி அறியார், ஊக்கத்தின் ஊக்கி,
இடைக்கண் முரிந்தார் பலர்.

One should be aware of one’s own strength and not over rate oneself getting carried away. There are many in history who thought so and were destroyed by a stronger enemy.