The Quran, also romanized Qur'an or Koran, is the central religious text of Islam, believed by Muslims to be a revelation from God. In addition to its religious significance, it is widely regarded as the finest work in Arabic literature, and has significantly influenced the Arabic language. Muslims regard the Quran as Muhammad's most important miracle; a proof of his prophethood; and the culmination of a series of divine messages starting with those revealed to Adam, including the Torah, the Psalms and the Gospel.