 Much of The True Intellectual System amounts to an extended consensus gentium argument for belief in God, demonstrable from an analysis of ancient sources which showed that most ancient philosophers were theists, and therefore that theism is compatible with philosophy. Among the non-theists, Cudworth (1678, p. 165) identifies four schools of atheistic philosophy, each of which is a type of materialism: Hylopathian atheism or materialism, ‘Atomical or Democritical’ atheism, Cosmo-plastic atheism (which makes the world-soul the highest numen), and Hylozoic atheism (which attributes life to matter). Each of these ancient brands of atheism has its latter-day manifestations in philosophers such as Hobbes (an example of a Hylopathian atheist) and Spinoza (a latter-day Hylozoist).