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Avarus non implebitur pecunia; et qui amat divitias, fructum non capiet ex eis.
He that loveth silver will not be satisfied with silver, nor he that loveth abundance with increase.

From the Old Testament: Ecclesiastes, V, 10 (c. 250 B.C.). It is probably the origin of "The More he has, the more he wants."

It is said that the multi-millionaire, John D. Rockefeller, was once asked, "How much money does it take to make a man happy?" His response: "Just a little more!"