Thirukkural

உலகத்தோடு ஒட்ட ஒழுகல் பலகற்றும் கல்லார் அறிவிலா தார்

Ulakaththotu Otta Ozhukal Palakatrum Kallaar Arivilaa Thaar

Those who know not how to act agreeably to the world, though they have learnt many things, are still ignorant