What has the ancient doctrine of the Trinity to do with the twentyfirst century? Is it just a fossil from the past, fit only for a museum? Does it have anything to say to modern concerns?There is currently a revival of interest in the doctrine, but few seek to put it firmly into the modern world. Without this, it will soon be neglected again.Far from irrelevance, the doctrine of the Trinity has an impact on the relationship of science to Christian belief, to the drive towards sexual equality, to the impersonality of modern life, and other issues.The book attempts a new presentation of the Trinity that is consistent with the Bible and ancient formulations, but is consistent with the modern world.Provocative? intentionally so, but with the hope that the doctrine will once again find its place in the centre of Christian belief and practice.