Summary: Melvyn Bragg and his guests discuss the Ontological Argument. In the 11th century Anselm of Canterbury proposed that it was possible to prove the existence of God using reason alone. His argument was taken further by later thinkers including Descartes, Spinoza and Leibniz but other philosophers have rejected it. It remains one of the most discussed problems in philosophy. Melvyn Bragg is joined by John Haldane, Professor of Philosophy at the University of St Andrews; Peter Millican, Professor of Philosophy at the University of Oxford and Clare Carlisle, Lecturer in Philosophy of Religion at King's College London.
