The quote belongs to Francisco María Arouet de Voltaire (1694-1779) One of the greatest philosophers form XVIII century. Voltaire is a deist and aspires to demonstrate the existence of God by rational means, in opposition to the mystical-religious doctrine of revelation; an essential demonstration of the existence of God is, according to Voltaire, the perfect construction of the Universe. This famous phrase, about the irrationality induced by the dogmatic belief that religion and the church imposes, particularly opposed to superstition, prejudice, and fanaticism. Though his beliefs were direct critics to Catholicism, nowadays it is believed that Islamic syncretism can also be explained through his point of view, when interpreting the Coran, justifying the “sacred war" (the Islamic Jihad) against impure ones, by God’s Word.