On Sunday at 4:30 p.m., the best selection of the National Gallery’s Carl Theodor Dreyer festival is screened. I wrote about the series a few weeks ago. This is a reminder: For anyone who has equivocated about attending, Sunday is the day to commit. Ordet is a masterpiece and a deeply moving study of God, faith, doubt and decency. I’ve had a few moments when I’ve thought of converting. Once, in a church in Rome, when the organist began playing Frescobaldi. A few times in the Sierra Nevada, at sunset. And, most recently, watching Ordet.