President Niyazov wrote his own religious text, published in separate volumes in 2001 and 2004, entitled the ''Ruhnama'' ("Book of the Soul"). The Turkmenbashy regime required that the book, which formed the basis of the educational system in Turkmenistan, be given equal status with the Quran (mosques were required to display the two books side by side). The book was heavily promoted as part of the former president's personality cult, and knowledge of the ''Ruhnama'' was required even for obtaining a driver's license. Quotations from the ''Ruhnama'' are inscribed on the walls of the Türkmenbaşy Ruhy Mosque, which many Muslims consider sacrilege.