October 19

…amongst many instances, one day four learned and accomplished scholars of the divines of Núr [in northern Persia] were present in His [Baha’u’llah’s] company, and in such wise did He expound that all four were involuntarily constrained to entreat Him to accept them for His service. For by dint of His eloquence, which was like “evident sorcery,” He satisfied these eminent doctors that they were in reality children engaged in the rudiments of study and the merest tyros, and that therefore they must read the alphabet from the beginning. Several protracted conferences were passed in expounding and elucidating the Point and the Alif of the Absolute, wherein the doctors present were astounded, and filled with amazement and astonishment at the seething and roaring of the ocean of His utterance. The report of this occurrence reached the hearing of far and near, and deep despondency fell on the adversaries. The regions of Núr were filled with excitement and commotion at these events… 
(‘Abdu’l-Baha, ‘A Traveler’s Narrative’)