In the "Bayan" the Báb says that every religion of the past was fit to become universal. The only reason why they failed to attain that mark was the incompetence of their followers. He then proceeds to give a definite promise that this would not be the fate of the revelation of "Him Whom God would make manifest" [Baha'u'llah], that it will become universal and include all the people of the world. (From a letter dated 20 February 1932 written on behalf of Shoghi Effendi to an individual believer, The Compilation of Compilations vol II, p. 4)
