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This week barrister Neil Addison argues that Cameron is about to open a Pandora’s box on marriage; Vatican watcher Edward Pentin says Regensburg still haunts Catholic-Muslim relations; and Fr Andrew Burnham, former Anglican bishop and member of Britain’s ordinariate, starts a series of Lenten reflections. Meanwhile, the Herald’s Spiritual Life section gains two new features: Fr John Zuhlsdorf, the world’s leading priest-blogger, begins a column on the new Mass translation; and the team behind Magnificat offer reflections on daily Mass readings.