During nine years, as foretold by the Báb Himself, swiftly, mysteriously and irresistibly the embryonic Faith conceived by Him had been developing until, at the fixed hour, the burden of the promised Cause of God was cast amidst the gloom and agony of the Síyáh-_Ch_ál of Ṭihrán. “Behold,” Bahá’u’lláh Himself, years later, testified, in refutation of the claims of those who had rejected the validity of His mission following so closely upon that of the Báb, “how immediately upon the completion of the ninth year of this wondrous, this most holy and merciful Dispensation, the requisite number of pure, of wholly consecrated and sanctified souls has been most secretly consummated.” “That so brief an interval,” He, moreover has asserted, “should have separated this most mighty and wondrous Revelation from Mine own previous Manifestation is a secret that no man can unravel, and a mystery such as no mind can fathom. Its duration had been foreordained.” St. John the Divine had himself, with reference to these two successive Revelations, clearly prophesied: “The second woe is past; and, behold the third woe cometh quickly.” “This third woe,” ‘Abdu’l-Bahá, commenting upon this verse, has explained, “is the day of the Manifestation of Bahá’u’lláh, the Day of God, and it is near to the day of the appearance of the Báb.” “All the peoples of the world,” He moreover has asserted, “are awaiting two Manifestations, Who must be contemporaneous; all wait for the fulfillment of this promise.” And again: “The essential fact is that all are promised two Manifestations, Who will come one following on the other.” _Sh_ay_kh_ Aḥmad-i-Ahsá’í, that luminous star of Divine guidance who had so clearly perceived, before the year sixty, the approaching glory of Bahá’u’lláh, and laid stress upon “the twin Revelations which are to follow each other in rapid succession,” had, on his part, made this significant statement regarding the approaching hour of that supreme Revelation, in an epistle addressed in his own hand to Siyyid Kázim: “The mystery of this Cause must needs be made manifest, and the secret of this Message must needs be divulged. I can say no more. I can appoint no time. His Cause will be made known after Ḥin (68).”