The Bahá'í Faith teaches that the world should adopt an international auxiliary language, which people would use in addition to their mother tongue. The aim of this teaching is to improve communication and foster unity among peoples and nations. The Bahá'í teachings state, however, that the international auxiliary language should not suppress existing natural languages, and that the concept of unity in diversity must be applied to preserve cultural distinctions.
The teachings of the Bahá'í Faith have a strong focus on the unity of humankind. The Bahá'í teachings see improved communication between peoples throughout the world as a vital part of world unity and peace. The Bahá'í teachings see the current multiplicity of languages as a major impediment to unity, since the existence of so many languages cuts the free flow of information and makes it difficult for the average individual to obtain a universal perspective on world events.
The principle of the selection and institutionalization of a Universal/International Auxiliary Language is among the Bahá'í Faith's key tenets.Bahá'u'lláh, the founder of the Bahá'í Faith, writing in the Tablets of Ishráqát and Maqṣúd, taught that the lack of a common language is a major barrier to world unity since the lack of communication between peoples of different languages undermines efforts toward world peace due to misunderstandings of language; he urged that humanity should choose an auxiliary language that would be taught in schools in addition to one's own native language, so that people could understand one another. He stated that until an auxiliary language is adopted, complete unity between the various parts of the world would continue to be unrealized.`Abdu'l-Bahá, the son of the founder of the religion, called the promotion of the principle of the international auxiliary language "the very first service to the world of man" and its realization as "the greatest achievement of the age in conferring profit and pleasure on mankind."