This book is divided into three volumes with ten sections. The writing of the book began in the latter part of 1925 and was completed in June 1927. The following explanation by the author himself on the nature of the book is quoted from an announcement in Issue No. 3 of The Present Testimony: "This book puts particular emphasis on spiritual reality. Hence, what is covered in each volume can all be attested in experience; nothing is there as an empty word.