A “period of ceaseless and unprecedented commotion” and Baha’u’llah’s “dual function of saving a sorely-stricken Faith from annihilation, and of ushering in the Dispensation destined to supersede it.”

The momentous happenings associated with the Báb’s incarceration in Máh-Kú and Chihríq, constituting as they did the high watermark of His Revelation, could have no other consequence than to fan to fiercer flame both the fervor of His lovers and the fury of His enemies. A persecution, grimmer, more odious, and more shrewdly calculated than any which Husayn Khán, or even Hájí Mírzá Áqásí, had kindled was soon to be unchained, to be accompanied by a corresponding manifestation of heroism unmatched by any of the earliest outbursts of enthusiasm that had greeted the birth of the Faith in either Shíráz or Isfahán. This period of ceaseless and unprecedented commotion was to rob that Faith, in quick succession, of its chief protagonists, was to attain its climax in the extinction of the life of its Author, and was to be followed by a further and this time an almost complete elimination of its eminent supporters, with the sole exception of One Who, at its darkest hour, was entrusted, through the dispensations of Providence, with the dual function of saving a sorely-stricken Faith from annihilation, and of ushering in the Dispensation destined to supersede it. 

- Shoghi Effendi  (Chapter 3, ‘God Passes By’)