The first seventy-seven years of the preceding century, constituting the Apostolic and Heroic Age of our Faith, fell into three distinct epochs, of nine, of thirty-nine and of twenty-nine years' duration, associated respectively with the Bábí Dispensation and the ministries of Bahá'u'lláh and of 'Abdu'l-Bahá. This Primitive Age of the Bahá'í Era, unapproached in spiritual fecundity by any period associated with the mission of the Founder of any previous Dispensation, was impregnated, from its inception to its termination, with the creative energies generated through the advent of two independent Manifestations and the establishment of a Covenant unique in the spiritual annals of mankind.
The last twenty-three years of that same century coincided with the first epoch of the second, the Iron and Formative, Age of the Dispensation of Bahá'u'lláh -- the first of a series of epochs which must precede the inception of the last and Golden Age of that Dispensation -- a Dispensation which, as the Author of the Faith has Himself categorically asserted, must extend over a period of no less than one thousand years, and which will constitute the first stage in a series of Dispensations, to be established by future Manifestations, all deriving their inspiration from the Author of the Bahá'í Revelation, and destined to last, in their aggregate, no less than five thousand centuries.... (Shoghi Effendi, ‘The Challenging Requirements of the Present Hour, 5 June 1947’, ‘Citadel of Faith: Messages to America 1947-1957’; The Compilation of Compilations, vol. II, The Significance of the Formative Age of Our Faith)
