One school of thought within Judaism claims that the true, magical "name" of what we term G-d was deliberately forgotten by the authors of the Torah. This comes from the belief that to know ones "name"...that true divine "name"...is to have power to command. No one can or should have such power over the supreme being, creator of the Universe, therefore, it was erased from the very deepest of memories of mankind. This is why Jews often refer to the supreme being simply as "HaShem", literally "The Name". So Leonard is speaking here of calling upon that creator. To do so, we humble ourselves and "stand in rags". Our very tears remove all negative emotions. We stand before the divine as newborn babes, clad only in the swaddling rags used to give comfort and security to one so recently freed from the womb. Those same scraps of cloth that give comfort to a newborn are the same rags used in Biblical times to bind a corpse prior to burial. When you think about it, both birth and death are the same...a transition from one state of being to another. So when a Jew speaks to G-d, s/he must remove all the trappings of the world and enter that transition state..."In our Rags of Light"...put away all ego and self importance, and stand humbly, accepting the Will of the divine.This is the way we summon one another, but it is not the way we call upon the Name. We stand in rags, we beg for tears to dissolve the immovable landmarks of hatred. How beautiful our heritage, to have this way of speaking to eternity, how bountiful this solitude, surrounded, filled, and mastered by the Name, from which all things arise in splendour, depending one upon the other.