existence. The opening of the book emphasizes the necessity of understanding different methods of inquiry into the nature of humanity. Angervo contrasts the empirical scientist, who relies solely on physical senses and instrumentation, with the occultist, who asserts that deeper truths about a person's essence can be uncovered beyond mere physical observation. He presents the argument that true understanding of humanity requires the integration of both empirical and esoteric knowledge, encouraging readers to reflect on the limitations of conventional scientific approaches. Furthermore, Angervo introduces concepts of hidden realms of human experience, setting the stage for a deeper exploration into the intricacies of existence and the various dimensions of human consciousness that may lie beyond traditional scientific boundaries. (This is an automatically generated summary.)