The book by bachelor of religious studies, Orthodox doctor and medical psychologist K. V. Zorin is devoted to a very pressing topic. The author analyzes to what extent a person’s personality, his health and attitude to the world around him depend on heredity. The book fascinatingly talks about the genetic roots of some diseases and sinful passions, about how genes, innate inclinations and instincts influence our actions. This makes the material interesting and useful to a wide range of readers. The book is addressed to those who are trying to understand themselves more deeply, understand their loved ones and resolve pressing health problems.