Allah revealed the Quran 14 centuries ago as the sole guide for humanity, containing perfect literary language, wisdom, and many scientific truths. The Qur'an contains facts that could not have been known at the time of its revelation. In the 7th century, when it was sent down, Arab society was awash with superstitious and groundless notions, but the Qur'an replaced ignorance with knowledge and illogical conjecture with guidance and certainty. Its verses contain key facts about the creation of the universe, the development of the human being, the structure of the atmosphere and more, proving that the Qur'an is the word of Allah.