While Kol Nidrei—a prayer wherein we release vows—is certainly traditionally seen as one of the most important prayers of the year, there is little in Jewish literature to support this idea. The question, however, remains: why does Jewish tradition lend so much weight and solemnity to this seemingly technical prayer? There are those who have claimed that the reason goes back to the days of the Spanish Inquisition, when the conversos (Jews who chose to convert to Christianity rather than face expulsion or death, but remained faithful to Judaism at heart, and to some degree in observance too) would gather...