With the Illinois legislature poised to consider a bill to legalize same-sex marriage, Chicago's Cardinal Francis George officially entered the political fray by issuing a letter that urges Catholics to urge their representatives to oppose the legislation. The core of George's argument was straightforward: "Civil laws that establish 'same-sex marriage' create a legal fiction," he wrote, because the "State has no power to create something that nature tells us is impossible."

Really? "Impossible"? Where, exactly, does "nature" tell us that? Does "nature" speak directly to Cardinal George? More likely, George got his information from Saint Thomas Aquinas, who communed with "nature" 750 years ago. In his prodigious Summa Theologica, Thomas largely rewrote much of Christian moral theology and provided a rationale in "nature" for the notion that same-sex sex is contemptible in the sight of God.

Thomas posited that God had instituted the order of nature by which everything was fittingly directed to its proper end; that God had created "natural" coitus for the sole purpose of procreation; that man should not contravene the order of nature; and that man therefore should not engage in any sexual act that is not directed to procreation.

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