That a theologian has been asked to contribute a lecture to this series on the philosophy of religion is, I assume, not an invitation to him to play amateur philosopher, but to offer, for what it is worth, what he can. I have conceived it my responsibility, therefore, both to those to whom I owe the honour of the invitation to be here, and to the furtherance of honest discussion between philosophers and theologians, to take as my task a clarification of what theology is, what a theologian is up to when he is doing theology.