The Quran (English pronunciation: //[n 1] kor-AHN , Arabic: القرآن al-qur'ān, IPA: [qurˈʔaːn],[n 2] literally meaning "the recitation", also romanised Qur'an or Koran) is the central religious text of Islam, which Muslims believe to be a revelation from God (Arabic: الله, Allah). It is widely regarded as the finest piece of literature in the Arabic language. Muslims consider the Quran to be the only book that has been protected by God from distortion or corruption. However, some significant textual variations (employing different wordings) and deficiencies in the Arabic script mean the relationship between the text of today's Quran and an original text is unclear. Quranic chapters are called suras and verses are called ayahs.