Kural - 952

In these three things the men of noble birth fail not:
In virtuous deed and truthful word, and chastened thought

Explanation
The high-born will never deviate from these three; good manners, truthfulness and modesty.

Tamil Transliteration
Ozhukkamum Vaaimaiyum Naanum Im Moondrum
Izhukkaar Kutippiran Thaar.