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Philosopher Paul Tyson’s talk, entitled “Escaping the Silver Chair: Renewed Minds and Our Vision of Reality,” explores how the Christian responsibility “to repent” involves more than expressing feelings of regret for moral wrong-doing and the desire to reform. Rather, the New Testament call to “repentance,” the English rendition of the Greek word metanoia, is inseparable from radically reenvisioning what is “really real.” St. Paul’s admonition that we be “transformed by the renewing of our minds” — in other words, metanoia — invokes a process that demands the recognition and rejection of various false enchantments of this world. With the help of C. S. Lewis’s story The Silver Chair, however, we realize that identifying and then escaping the ways in which we are bewitched is no easy task. $4.