The most significant mystical contribution to the Siddur is the Kedusha, said in three different forms, most notably during the readers repetition of the Amida ... This is a mystical idea, and like all mysticism it hovers at the edge of intelligibility. Mysticism is an attempt to say the unsayable, know the unknowable, to reach out in language to a reality that lies beyond the scope of language. Often in the course of history, mysticism has tended to devalue the world of senses in favor of a more exalted realm of disembodied spirituality. Jewish mysticism did not take this course. Instead it chose to bathe our life on earth in the dazzling light of the Divine radiance.