The Writings of Thomas Paine: The Age of Reason by Thomas Paine. The Age of Reason; Being an Investigation of True and Fabulous Theology is a work by English and American political activist Thomas Paine, arguing for the philosophical position of Deism. It follows in the tradition of eighteenth-century British deism, and challenges institutionalized religion and the legitimacy of the Bible. It was published in three parts in 1794, 1795, and 1807. IN the opening year, 1793, when revolutionary France had beheaded its king, the wrath turned next upon the King of kings, by whose grace every tyrant claimed to reign. But eventualities had brought among them a great English and American heart-Thomas Paine. He had pleaded for Louis Caper-"Kill the king but spare the man." Now he pleaded, -"Disbelieve in the King of kings, but do not confuse with that idol the Father of Mankind!". In Paine's Preface to the Second Part of "The Age of Reason" he describes himself as writing the First Part near the close of the year 1793. "I had not finished it more than six hours, in the state it has since appeared, before a guard came about three in the morning, with an order signed by the two Committees of Public Safety and Surety General, for putting me in arrestation."