If we hadn’t seen enough Christmas lights this season — on houses, trees, bushes, and department stores — this past Sunday, we were absolutely festooned with them. The reading from Isaiah announced in the very first line: “Your light has come!” And it kept on coming. “Nations shall walk by your light,” the prophet continues, and the Scriptures go on to speak of “shining radiance,” “light,” and, in Matthew’s memorable gospel, the star that guided the magi to Bethlehem. We are positively blinded by illumination.