The original six sacred books of Manichaeism were written in Syriac Aramaic. They were soon translated into other languages to help spread the religion. As they spread to the east, the Manichaean writings passed through Middle Persian, Parthian, Sogdian, and ultimately Uyghur and Chinese translations. As they spread to the west, they were translated into Greek, Coptic, and Latin. The spread and success of Manichaeism were seen as a threat to other religions, and it was widely persecuted in Christian, Zoroastrian, and later, Islamic areas.