 Philosophers Speak of God demonstrates that Whitehead and Hartshorne are not the sole representatives of process theism, although they are its chief exponents. Buddhism, with its twin emphases on impermanence and dependent origination, is arguably the most sophisticated ancient form of process philosophy. Buddhist philosophers criticized the notion of a timeless absolute without, however, developing a form of process theism (e.g. Arnold 1998). Whitehead remarks that his concept of God has more richness than the Buddhist concept of nirvana and that his philosophy of religion could be viewed as an effort to “true up” the Buddhist idea (Johnson 1983, 8). Hartshorne maintains that aspects of process theism are in Plato’s later writings—specifically, the Sophist, the Timaeus, and the Laws—but they are never brought together into a coherent theory. Hartshorne sees process theism as providing the needed coherence (Dombrowski 2005 and Viney 2007).