Kural - 838

When folly's hand grasps wealth's increase, 'twill be
As when a mad man raves in drunken glee

Explanation
A fool happening to possess something is like the intoxication of one who is (already) giddy.

Tamil Transliteration
Maiyal Oruvan Kaliththatraal Pedhaidhan
Kaiyondru Utaimai Perin.