and bickering for nearly a quarter century, with Hobbes failing to admit his error to the end of his life. After years of debate, the spat over proving the squaring of the circle gained such notoriety that it has become one of the most infamous feuds in mathematical history. Religious views The religious opinions of Hobbes remain controversial as many positions have been attributed to him and range from atheism to Orthodox Christianity. In the Elements of Law, Hobbes provided a cosmological argument for the existence of God, saying that God is "the first cause of all causes". Hobbes was accused of atheism by several contemporaries; Bramhall accused him of teachings that could lead to atheism. This was an important accusation, and Hobbes himself wrote, in his answer to Bramhall's The Catching of Leviathan, that "atheism, impiety, and the like are words of the greatest defamation possible". Hobbes always defended himself from such accusations. In more recent times also, much has been made of his religious views by scholars such as Richard Tuck and J. G. A. Pocock, but there is still widespread disagreement about the exact significance of Hobbes's unusual views on religion. As Martinich has pointed out, in Hobbes's time the term "atheist" was often applied to people who believed in God but not in divine providence, or to people who believed in God but also maintained other beliefs that were considered to be inconsistent with such belief or judged incompatible with orthodox Christianity. He says that this "sort of discrepancy has led to many errors in determining who was an atheist in the early modern period". In this extended early modern sense of atheism, Hobbes did take positions that strongly disagreed with church teachings of his time. For example, he argued repeatedly that there are no incorporeal substances, and that all things, including human thoughts, and even God, heaven, and hell are corporeal, matter in motion. He argued that "though Scripture acknowledge spirits, yet doth it nowhere say, that they are incorporeal, meaning thereby without dimensions and quantity". (In this view, Hobbes claimed to be following Tertullian.) Like John Locke, he also stated that true revelation can never disagree with human reason and experience, although he also argued that people should accept revelation and its interpretations for the reason that they should accept the commands of their sovereign, in order to avoid war. While in Venice on