For this Purim-edition of “The BEST” Jeffrey Saks offers a reading of S.Y. Agnon’s “The Bridal Canopy” and its message for the holiday. “Naturally, if this novel’s plot twist is to take place on any particular day of the year, Purim is pre-programmed for such a thing. On this holiday of masks and disguised identities, what is concealed will be revealed, and God works it all out for his faithful in the end.”