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Within a year of each other, Joseph Schumpeter coined the term "Ricardian vice," which you mentioned earlier, and Milton Friedman launched his campaign to revive it as a cardinal virtue.

Intelligence, he added, is an area in which political loyalty is not always a cardinal virtue.

Belying his stern image, his first encyclical, the most authoritative form of papal writing, centered on love, one of three treatises he planned to write on the cardinal virtues of love, hope and faith.

Among the cardinal virtues, according to the Stoics, are courage and wisdom.

"I heard that forgiveness is a cardinal virtue for Hindus," I said.