There are, of course, many books on Jesus, and an increasing number on God; but books on the Trinity are still rare. That is not least because of the problems connected with it. At best it can be a mystery too soon, an intellectual obstacle on the obstacle course to heaven; at worst it can be an theological connection between the doctrine of the Trinity and the everyday life of Christians is tenuous in the extreme. Professor Mackey answers these problems by first bravely placing the doctrine of the Trinity in the broader context of contemporary culture, facing the dilemma that its recovery may actually widen the gap between Christians and their theological enemies (atheistic humanists) and potential allies (Jews and Moslems). He then searches out and analyses the origins of the doctrine, its roots in Christian belief and life (not forgetting the way in which it has so often led to distorted theologies), and assesses the prospect for its recovery in more intelligible theological terms.