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Pantheism is the doctrine that the world is either identical with God or an expression of His nature. Pantheistic ideas appear in many schools of Buddhism and Hinduism, and in the Tao-te-Ching. Pantheism also has had defenders in Western philosophy, including Heraclitus, Spinoza, Fichte, Schelling, and Hegel. Many of the Romantic poets, like Shelley, Keats, and Wordsworth, were considered pantheists. In modern times, the ecological movement has led to new interest in pantheism and its emphasis on nature as sacred. Is there a consistent world view that all these philosophies have in common? And how should we understand the claim that nature is to be worshipped? John and Ken welcome back Philip Clayton from the Claremont Graduate School, editor of "In Whom We Live and Move and Have Our Being: Panentheistic Reflections on God's Presence in a Scientific World."