In Toland's first book Christianity not Mysterious (1696), he argued that the divine revelation of the Bible contains no true mysteries; rather, all the dogmas of the faith can be understood and demonstrated by properly trained reason from natural principles. For this argument he was prosecuted by a grand jury in London. As he was a subject of the Kingdom of Ireland, members of the Parliament of Ireland proposed that he should be burnt at the stake, and in his absence three copies of the book were burnt by the public hangman in Dublin as the content was contrary to the core doctrines of the Church of Ireland.