Kural - 475

With peacock feathers light, you load the wain;
Yet, heaped too high, the axle snaps in twain

Explanation
The axle tree of a bandy, loaded only with peacocks' feathers will break, if it be greatly overloaded.

Tamil Transliteration
Peelipey Saakaatum Achchirum Appantanjjch
Aala Mikuththup Peyin.