Thirukkural

அமைந்தாங் கொழுகான் அளவறியான் தன்னை வியந்தான் விரைந்து கெடும்.

Amaindhaang Kozhukaan Alavariyaan Thannai Viyandhaan Viraindhu Ketum

He will quickly perish who, ignorant of his own resources flatters himself of his greatness, and does