ENDS AND MEANS mistakes is not spectacular or immediate. In many cases, indeed, the makers of the mistake are not even aware that they are being punished; for the punishment takes the form not of a deprivation of a good which they already possess, but of the withholding of a good which they might have come to possess if they had not made the mistake. Consider, by way of example, that once very common over-simplification of the facts which consists in making God responsible for all imperfectly understood phenomena. Secondary causes are ignored and everything is referred back to the creator. No more wholesale re- duction of diversity to identity is possible; and yet its effect is not immediately perceptible. Those who make the mistake of thinking in terms of a first cause are fated never to become men of science. But as they do not know what science is, they are not aware that they are losing anything. To refer phenomena back to a first cause has ceased to be fashionable, at any rate in the West. The identities to which we try to reduce the complicated diversities around us are of a different order. For example, when we discuss society or individual human beings, we no longer make our over-simplifications in terms of the will of God, but of such entities as economics, or sex, or the inferiority complex. Excessive simplifications! But here again the penalty for making them is not immediate or obvious. Our punishment consists in our inability to realize our ideals, to escape from the social and psychological slough in which we wallow. We shall never deal effectively with our human problems until we follow the example of natural scientists and temper our longing for rational simplification by the recognition in things and events of a certain residue or irrationality, diversity and specificity. We shall never succeed in changing our age of iron into an age qf gold until we give up our ambition to find a single cause for 14