Kural - 959

Of soil the plants that spring thereout will show the worth:
The words they speak declare the men of noble birth

Explanation
As the sprout indicates the nature of the soil, (so) the speech of the noble indicates (that of one's birth).

Tamil Transliteration
Nilaththil Kitandhamai Kaalkaattum Kaattum
Kulaththil Pirandhaarvaaich Chol.