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Concerning the “second” sign which Bahá’u’lláh indicates to
have been revealed in the Kitáb-i-Aqdas, Shoghi Effendi states that
Bahá’u’lláh, “...in His Most Holy Book, has enjoined the selection of a single
language and the adoption of a common script for all on earth to use, an
injunction which, when carried out, would, as He Himself affirms in that Book,
be one of the signs of the ‘coming of age of the human race’”.
- The Universal
House of Justice (The ‘Notes’ section of the ‘Kitab-i-Aqdas’)