The author and publishers would like to thank the following publishers for their courtesy in permitting the publication of extracts from copyright works: Messrs Routledge & Kegan Paul for God and the Soul (P. Geach); A. R. Mowbray and Co. for The Theology of Grace and the Oecumenical Movement (C. Moeller and G. Philips); Search Press for The Foundations of Belief (L. Dewart). Acknowledgment is also made to: Macmillan Services Ltd. for The Many-Faced Argument: Recent Studies on the Ontological Argument for the Existence of God (J. Hick and A. C. McGill); The S.C.M. Press Ltd. for Theism and Empiricism (A. B. Gibson); Geoffrey Bles Ltd. for The Degrees of Knowledge: Distinguish to Unite (J. Maritain); Messrs Sheed & Ward Ltd. for The Future of Belief: Theism in a World Come of Age (L. Dewart); Longman Group Ltd. for Insight: A Study of Human Understanding (B. J. F. Lonergan); A. & C. Black Ltd. for Metaphysics (E. Coreth); Penguin Books Ltd. for A Rumour of Angels: Modern Society and the Rediscovery of the Supernatural (P. L. Berger); and Editions Teéqui for Le Réalisme Méthodique (E. Gilson).