Pseudo-Dionysius the Areopagita is one of the most interesting theologians and philosophers of the Middle Ages. He was, probably, a Christian neoplatonist, a Syrian monk, who lived and worked in a circle of the latest neoplatonist school, e.g. Proclus and/or Damascius. He was called the Father of Christian apophatic mystics. His concept of mystical experience shows two fundamental aspects....