As regards your teaching work: the Guardian has already advised you to stress in your talks the idea of a world superstate, and the concept of the Oneness of Mankind underlying it. In addition, he wishes you also to emphasize the fact that humanity, taken as a whole, has entered the most critical and momentous stage of its evolution, the stage of maturity. This idea of the coming of age of mankind constitutes the central core of the Bahá'í Teachings, and is the most distinguishing feature of the Revelation of Bahá'u'lláh. A proper understanding of this concept gives the key to an adequate appreciation of the tremendous claim made by the Author of the Faith, both with regard to His own station, and to the incomparable greatness of His Dispensation.