This book introduces the Pseudo-Dionysian mystical theology, with glimpses at key stages in its interpretation and critical reception through the centuries. Part one reproduces and provides commentary on the elusive Areopagites own miniature essay, The Mystical Theology, impenetrable without judicious reference to the rest of the Dionysian corpus. Stages in the reception and critique of this Greek corpus and theme are sketched in part two, from the sixth-century through the twelfth and to the critical reaction and opposition by Martin Luther in the Reformation.