I read this in Greek translation from French. Bahram Elahi is an Iranian follower of the mystic tradition of Ahl-e Haqq (اهل حق), which is a spiritual path that could be said to be related to mystic Shia Islam. They believe in reincarnation, Prophets of all authentic Religions, etc.
What impressed me is the clarity, simplicity and deep knowledge of the author. He clearly knows how to tell between authentic and false Spiritual Teachers, since a true Teacher always encourages deep love towards God and Humanity, and not simply "spiritual" experiences that foster the Ego and are, therefore, spiritual drugs.
The book represents authentic spiritual streams from a very ancient and sacred part of our world.