Kural - 503

Though deeply learned, unflecked by fault, 'tis rare to see,
When closely scanned, a man from all unwisdom free

Explanation
When even men, who have studied the most difficult works, and who are free from faults, are (carefully) examined, it is a rare thing to find them without ignorance.

Tamil Transliteration
Ariyakatru Aasatraar Kannum Theriyungaal
Inmai Aridhe Veliru.