Many thanks for Rabbi Zahavy’s and Mr. Sutton’s thoughtful responses to my May 24 letter on the issue of the efficacy of prayer, particularly the Kaddish (“More on angels,” June 2). I would be grateful if any reader would care to respond to my question concerning the Kedusha: Why, in the Kedusha, does the Creator of the Universe need to hear words of praise from angels, beings who have no free will, and therefore no choice in the matter?