“In this most mighty Revelation,” He [Baha’u’llah] unequivocally announces, “all the Dispensations of the past have attained their highest, their final consummation. That which hath been made manifest in this preëminent, this most exalted Revelation, stands unparalleled in the annals of the past, nor will future ages witness its like.”
(‘The Dispensation of Baha’u’llah; included in ‘The World Order of Baha’u’llah’)