August 14

…in these years [A.H. one thousand two hundred and] sixty-six and sixty-seven throughout all Persia fire fell on the households of the Bábís, and each one of them, in whatever hamlet he might be, was, on the slightest suspicion arising, put to the sword. More than four thousand souls were slain, and a great multitude of women and children, left without protector or helper, distracted and confounded, were trodden down and destroyed. And all these occurrences were brought about solely by the arbitrary decision and command of Mírzá Taqí Khán, [Persian Prime Minister] who imagined that by the enactment of a crushing punishment this sect would be dispersed and disappear in such wise that all sign and knowledge of them would be cut off. Ere long had passed the contrary of his imagination appeared, and it became certain that [the Bábís] were increasing. The flame rose higher and the contagion became swifter: the affair waxed grave and the report thereof reached other climes. At first it was confined to Persia: later it spread to the rest of the world. Quaking and affliction resulted in constancy and stability, and grievous pains and punishment caused acceptance and attraction. The very events produced an impression; impression led to investigation; and investigation resulted in increase. Through the ill-considered policy of the Minister this edifice became fortified and strengthened, and these foundations firm and solid. Previously the matter used to be regarded as commonplace: subsequently it acquired a grave importance in men’s eyes. Many persons from all parts of the world set out for Persia, and began to seek with their whole hearts. For it hath been proved by experience in the world that in the case of such matters of conscience laceration causeth healing; censure produceth increased diligence; prohibition induceth eagerness; and intimidation createth avidity. 
(‘Abdu’l-Baha, ‘A traveler’s Narrative’)