The adoption of a universal auxiliary language;

In order to facilitate complete understanding between all people, a universal auxiliary language will be adopted and in the schools of the future two languages will be taught — the mother tongue and this international auxiliary tongue which will be either one of the existing languages or a new language made up of words from all the languages — the matter is to be determined by a confederation met for the purpose which shall represent all tribes and nations. This international tongue will be used in the work of the parliament of man — a supreme tribunal of the world which will be permanently established in order to arbitrate international questions. – Abdu’l-Baha, Divine Philosophy, p. 84.

A mutual language will become the mightiest means toward universal progress, for it will cement the east and the west. It will make the world one home and become the divine impulse for human advancement. It will upraise the standard of oneness of the world of humanity and make the earth a universal commonwealth. It will create love between the children of men and good fellowship between the various creeds. – Divine Philosophy, p. 142

The adoption of a universal auxiliary language

The Tower of Babel is a Near Eastern etiological myth that is recorded in the Jewish Tanakh's first book (Genesis); it is meant to explain the origin of different languages.According to the story, a united humanity of the generations following the Great Flood, speaking a single language and migrating eastward, came to the land of Shinar. There they agreed to build a city and a tower "tall enough to reach heaven"; this angered God, thus he confounded their speech so that they could no longer understand each other and scattered them around the world.

Esperanto is the most widely spoken constructed language in the world. It was created in the late 1870s by L. L. Zamenhof. Below is an image of the first Esperanto book.

"According to Zamenhof, he created the language to reduce the 'time and labour we spend in learning foreign tongues' and to foster harmony between people from different countries: 'Were there but an international language, all translations would be made into it alone ... and all nations would be united in a common brotherhood.'"

"The heart is like a box, and language is the key. Only by using the key can we open the box and observe the gems it contains. Therefore, the question of an auxiliary international tongue has the utmost importance. Through this means international education and training become possible; the evidence and history of the past can be acquired. The spread of the known facts of the human world depends upon language. The explanation of divine teachings can only be through this medium. As long as diversity of tongues and lack of comprehension of other languages continue, these glorious aims cannot be realized. Therefore, the very first service to the world of man is to establish this auxiliary international means of communication. It will become the cause of the tranquility of the human commonwealth. Through it sciences and arts will be spread among the nations, and it will prove to be the means of the progress and development of all races."

Abdu'l-Baha, The Promulgation of Universal Peace