Union of Christ and the Church, in a Shadow (1642); A Sermon preached before the House of Commons (1647); and A Discourse concerning the True Notion of the Lord's Supper (1670). Much of Cudworth's work remains in manuscript. However, certain surviving works have been published posthumously, such as A Treatise concerning eternal and immutable Morality, and A Treatise of Freewill. A Treatise concerning eternal and immutable Morality (posth.) Cudworth's Treatise on eternal and immutable Morality, published with a preface by Edward Chandler (1731), is about the historical development of British moral philosophy. It answers, from the standpoint of Platonism, Hobbes's famous doctrine that moral distinctions are created by the state. It argues that just as knowledge contains a permanent intelligible element over and above the flux of sense-impressions, so there exist eternal and immutable ideas of morality. A Treatise of Freewill (posth.) Another posthumous publication was Cudworth's A Treatise of Freewill, edited by John Allen (1838). Both this and the Treatise on eternal and immutable Morality are connected with the design of his magnum opus, The True Intellectual System of the Universe. The True Intellectual System of the Universe (1678) In 1678, Cudworth published The True Intellectual System of the Universe: the first part, wherein all the reason and philosophy of atheism is confuted and its impossibility demonstrated, which had been given an Imprimatur for publication (29 May 1671). The Intellectual System arose, according to Cudworth, from a discourse refuting "fatal necessity", or determinism. Enlarging his plan, he proposed to prove three matters: (a) the existence of God; (b) the naturalness of moral distinctions; and (c) the reality of human freedom. These three comprise, collectively, the intellectual (as opposed to the physical) system of the universe; and they are opposed, respectively, by three false principles: atheism, religious fatalism (which refers all moral distinctions to the will of God), and the fatalism of the ancient Stoics (who recognized God and yet identified him with nature). Only the first part, dealing with atheism, was ever published. Cudworth criticizes two main forms of materialistic atheism: the atomic (adopted by Democritus, Epicurus and Thomas Hobbes); and the hylozoic (attributed to Strato of Lampsacus, which explains everything by the supposition of an inward self-organizing life in matter). Atomic atheism, to which Cudworth devotes the larger part of the work, is described as arising from the combination of two principles, neither of which is, individually, atheistic