Kural - 667

Despise not men of modest bearing; Look not at form, but what men are:
For some there live, high functions sharing, Like linch-pin of the mighty car

Explanation
Let none be despised for (their) size; (for) the world has those who resemble the linch-pin of the big rolling car.

Tamil Transliteration
Uruvukantu Ellaamai Ventum Urulperundherkku
Achchaani Annaar Utaiththu.