Here, he discusses how modern culture finds it hard to "hear" the Catholic Church because modern culture has discarded the idea of formal and final causes.
Perhaps I shouldn't say this, but I think there are an awful lot of bad Catholic apologetics and bad Catholic commentary out there. Walk into Veritas books in Abbey Street and take any book from the shelf; most likely even a glance at the blurb will tell you that it's full of platitudes.
Father Barron is one of those commentators who avoids platitudes, and who strikes at the heart of a topic. Here, he addresses an important philosophical question that has profound implications on how Catholics (and their secular critics) view such matters as sex, the family, freedom, and human life-- and a lot more besides.