 Hobbes first made a notable impact with philosophical writings in the early 1640s. These included his Elements of Law and De Cive. The Elements of Law, which Hobbes circulated in 1640, is the first work in which Hobbes follows his typical systematic pattern of starting with the workings of the mind and language, and developing the discussion towards political matters. De Cive (1642) was Hobbes’s first published book of political philosophy. This work focuses more narrowly on the political: its three main sections are titled “Liberty”, “Empire” and “Religion”. However, De Cive was conceived as part of a larger work, the Elements of Philosophy. That work eventually had three parts: De Corpore (1655), De Homine (1658), and De Cive itself. De Corpore, which is discussed below, covers issues of logic, language, method, metaphysics, mathematics, and physics. De Homine, meanwhile, focuses on matters of physiology and optics.