Isis Unveiled. Illustrated H.P. Blavatsky

Isis Unveiled is a landmark book on occult philosophy. It examines the religious aspects of the philosophical works of Plato, Plotinus, Pythagoras, Paracelsus, Giordano Bruno, and others. It also delves into the classical religious texts of Christianity, Buddhism, Hinduism, Zoroastrianism, etc., with the aim of recognizing Hermetic philosophy as the only key to discovering "absolutes in Science and Theology."
Blavatsky describes herself to her readers as a world traveler, having visited both the Americas, Siberia, Africa, India, and Tibet. During her journeys, custodians of ancient knowledge allegedly revealed many secrets of the universe to her. The trip and all of the events she encountered had been prepared for her under the guidance of the guardians, so that she could record and pass on the deep absolutes of the past.