This book is not a book of theories-it deals with facts. Its author regards the best of theories as but working hypotheses to be used only until better ones present themselves. The " fact" is the principal thing-the essential thing-to uncover which the tool, theory, is used. Это и многое другое вы найдете в книге The Science of Psychic Healing (Body and Mind) (Yogi Ramacharaka)