Ayn Rand's Atlas Shrugged contains a number of quotable and pithy speeches, but none so rich as the speech by Francisco d'Aconia
“So you think that money is the root of all evil?” said Francisco d’Anconia. “Have you ever asked what is the root of money? Money is a tool of exchange, which can’t exist unless there are goods produced and men able to produce them. Money is the material shape of the principle that men who wish to deal with one another must deal by trade and give value for value. Money is not the tool of the moochers, who claim your product by tears, or of the looters, who take it from you by force. Money is made possible only by the men who produce. Is this what you consider evil?"
“Until and unless you discover that money is the root of all good, you ask for your own destruction. When money ceases to be the tool by which men deal with one another, then men become the tools of men. Blood, whips and guns–or dollars. Take your choice–there is no other–and your time is running out.”
Capitalism Magazine reprints the entire speech here.