"What Marriage Is—And What It Isn't" appeared as an article in the August/September 2009 issue of the journal *First Things*. Its author, Dr. Robert P. George, McCormick Professor of Jurisprudence at Princeton University, is perhaps the most prominent of the new natural lawyers who, in recent years, have revivified the millennial Western teaching on natural law. In this lecture, Professor Steven Cortright, Co-founder of the St. Anthony of Padua Institute, builds on Dr. George's essay to explain the unique moral status of marriage as the one-flesh union of husband and wife and its place in the Church as the Body of Christ.
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