In 1937, Helen Roerich published a book called “Brotherhood” based on her diary entries for the period from September 24, 1936 to July 8, 1937. It was also included in the series of the author’s books, “Doctrine of Living Ethics”. It was the very First book about the Brotherhood.Almost 60 years later, in 1995-1997, Zinovya Dushkova wrote down the Second book “Brotherhood. Supermundane Abode” and published it in 1997 as a continuation of the First one, since the information was accepted by the author from the same Higher Source. In addition, this Second book, “Brotherhood. Supermundane Abode”, heralded the beginning of the author’s Recordings of the books series “The Teaching of the Heart”, being the fundamental link indicating continuity between the two Teachings. It gave it the full right to be an Introductory book to the books series “The Teaching of the Heart” which consists, together with the above-mentioned, of fourteen books. Besides, the books series “The Teaching of the Heart” includes — as number nine — the Third book with a similar title “Brotherhood. Abode of the Fire”. Thus, all three books make up a single Triptych.