Kural - 750

Howe'er majestic castled walls may rise,
To craven souls no fortress strength supplies

Explanation
Although a fort may possess all (the above-said) excellence, it is, as it were without these, if its inmates possess not the excellence of action.

Tamil Transliteration
Enaimaatchith Thaakiyak Kannum Vinaimaatchi
Illaarkan Illadhu Aran.