What is man? This is the central intellectual question of the twentieth century, when we all know that what is technical needs to be subordinated what is human but we know, too, that man has largely last his self confidence. The Christian tradition has great resources to contribute to this vital discussion. Here, the careful work of Professor David Cairns of Aberdeen of William Temple College, Manchester, who was previously director of the studies sponsored by the World Council of Churches on the basic nature of humanity in an era swift change.