About the Mystery of the Letters the mid-6th century, in which Mar Saba had played an important role. The anonymous author of the treatise declares he was prompted to the study of the secret meanings of the letters by the words of the Apocalypse, "I am the Alpha and Omega", and that he subsequently received a vision about them on Mount Sinai. The author proposes a re-modelled Greek alphabet reduced to 22 letters on the model of the 22 letters of Hebrew (discounting Xi Ξ and Psi Ψ), and with the Hebrew letter names. He then interprets these letters as symbolic figures of 22 works of
History of the Hebrew alphabet but following the rise of Christianity (and later, the rise of Islam), they gave way to the Latin and Arabic scripts, respectively. The Hebrew alphabet was later adapted in order to write down the languages of the Jewish diaspora (Karaim, Judæo-Arabic, Ladino, Yiddish, etc.), and was retained all the while in relatively unadapted form throughout the diaspora for Hebrew, which remained the language of Jewish law, scriptures and scholarship. The Hebrew alphabet was also retained as the alphabet used for writing down the Hebrew language during its rebirth as an everyday modern language starting in the 18th to 19th century.