Kural - 670

The world desires not men of every power possessed,
Who power in act desire not,- crown of all the rest

Explanation
The great will not esteem those who esteem not firmness of action, whatever other abilities the latter may possess.

Tamil Transliteration
Enaiththitpam Ey Thiyak Kannum Vinaiththitpam
Ventaarai Ventaadhu Ulaku.