Kural - 973

The men of lofty line, whose souls are mean, are never great
The men of lowly birth, when high of soul, are not of low estate

Explanation
Though (raised) above, the base cannot become great; though (brought) low, the great cannot become base.

Tamil Transliteration
Melirundhum Melallaar Melallar Keezhirundhum
Keezhallaar Keezhal Lavar.