At an Esperanto meeting in Paris in 1913, `Abdu’l-Bahā uttered the following words about this language:
“Now, praise be to God that Dr. Zamenhof (The creator of Esperanto) has invented the Esperanto language. It has all the potential qualities of becoming the international means of communication. All of us must be grateful and thankful to him for this noble effort; for in this way he has served his fellowmen well. With untiring effort and self-sacrifice on the part of its devotees Esperanto will become universal. Therefore every one of us must study this language and spread it as far as possible so that day by day it may receive a broader recognition, be accepted by all nations and governments of the world, and become a part of the curriculum in all the public schools. I hope that Esperanto will be adopted as the language of all the future international conferences and congresses, so that all people need acquire only two languages—one their own tongue and the other the international language. Then perfect union will be established between all the people of the world. Consider how difficult it is today to communicate with various nations. If one studies fifty languages one may yet travel through a country and not know the language. Therefore I hope that you will make the utmost effort, so that this language of Esperanto may be widely spread.“
Reference: J. E. Esslemont, Bahā’u’llāh and the New Era, p.165
Although `Abdu’l-Bahā had made explicit statements about making great effort to spread this language as far as possible, the UHJ is yet to accept this language as a universal auxiliary language.
courtesy:- Twelve Principles – A Comprehensive Investigation on the Bahai Teachings