In seeking for fuller knowledge about the movement I found considerable difficulty in obtaining the literature I wanted, and soon conceived the idea of putting together the gist of what I learned in the form of a book, so that it might be more easily available for others. When communication with Palestine was reopened after the war, I wrote to ‘Abdu’l-Bahá and enclosed a copy of the first nine chapters of the book, which was then almost complete in rough draft. I received a very kind and encouraging reply, and a cordial invitation to visit Him in Haifa and bring the whole of my manuscript with me. The invitation was gladly accepted, and I had the great privilege of spending two and a half months as the guest of ‘Abdu’l-Bahá during the winter of 1919–1920. During this visit ‘Abdu’l-Bahá discussed the book with me on various occasions. He gave several valuable suggestions for its improvement and proposed that, when I had revised the manuscript, He would have the whole of it translated into Persian so that He could read it through and amend or correct it where necessary. The revisal and translation were carried out as suggested, and ‘Abdu’l-Bahá found time, amid His busy life, to correct some three and a half chapters (Chapters I, II, V and part of III) before He passed away. It is a matter of profound regret to me that ‘Abdu’l-Bahá was not able to complete the correction of the manuscript, as the value of the book would thereby have been greatly enhanced. The whole of the manuscript has been carefully revised, however, by a committee of the National Bahá’í Assembly of England, and its publication approved by that Assembly. I am greatly indebted to Miss E. J. Rosenberg, Mrs. Claudia S. Coles, Mírzá Lutfu’lláh S. Hakím, Messrs. Roy Wilhelm and Mountfort Mills and many other kind friends for valuable help in the preparation of the work. As regards the transliteration of Arabic and Persian names and words, the system adopted in this book is that recently recommended by Shoghi Effendi for use throughout the Bahá’í World. J. E. ESSLEMONT Fairford, Cults, By Aberdeen. CHAPTER 1: THE GLAD TIDINGS The Promised One of all the peoples of the world hath appeared. All peoples and communities have been expecting a Revelation, and He, Bahá’u’lláh, is the foremost teacher and educator of all mankind.—‘ABDU’L-BAHÁ. The Greatest Event in History If we study the story of the “ascent of man” as recorded in the pages of history, it becomes evident that the leading factor in human progress is the advent, from time to time, of men who pass beyond the accepted ideas of their day and become the discoverers and revealers of truths hitherto unknown among mankind. The inventor, the pioneer, the genius, the Prophet—these are the men on whom the transformation of world primarily depends. As Carlyle says:—