"Regarding the subject of Esperanto; it should be made clear to the
believers that while the teaching of that language has been repeatedly
encouraged by 'Abdu'l-Baha, there is no reference either from Him or from
Baha'u'llah that can make us believe that it will necessarily develop into
the international auxiliary language of the future. Baha'u'llah has
specified in His Writings that such a language will either have to be
chosen from one of the existing languages, or an entirely new one should
be created to serve as a medium of exchange between the nations and
peoples of the world. Pending this final choice, the Baha'is are advised
to study Esperanto only in consideration of the fact that the learning of
this language can considerably facilitate intercommunication between
individuals, groups and Assemblies throughout the Baha'i world in the
present stage of the evolution of the Faith."