Gordon Gekko's 12th Century Source?

I'm reading Hillel Halkin's book on the 12th century Spanish-Hebrew poet Yehuda Halevi, who lived in cities including Córdoba. Halkin remarks on his time there:

In Córdoba he had many old friends and acquaintances. There was Avraham ibn Ezra, a ruefully witty and financially unsuccessful wanderer who once joked in a poem that if he were to go into the candle trade, the sun would never set, and that men would cease to die if he sold shrouds.

This reminded me of the scene in Wall Street where Bud Fox meets Gordon Gekko for the first time, and Gekko says about the CEO of Teldar Paper:

Why the hell is Cromwell giving a lecture tour when he's losing 60 million a quarter? Guess he's giving lectures in how to lose money. If this guy owned a funeral parlor, no one would die!