How can we claim to know God without encroaching on his unknowability? Does our knowledge of God have any bearing on the way in which we live in our community and behave towards the world? And if there is any bearing, does the doctrine of the Trinity make any difference? In this revised and expanded edition of a classic work, Professor Gunton explores the theology of the Trinity. Central to his work is his argument that the doctrine should offer ways of articulating the being of God and of the world so that we may be better able to live before God and with each other.