The impact of the alteration in methods of scientific thinking upon moral ideas is, in general, obvious. Goods, ends are multiplied. Rules are softened into principles, and principles are modified into methods of understanding. Ethical theory began among the Greeks as an attempt to find a regulation for the conduct of life which should have a rational basis and purpose instead of being derived from custom. But reason as a substitute for custom was under the obligation of supplying objects and laws as fixed as those of custom had been. Ethical theory ever since has been singularly hypnotized by the notion that its business is to discover some final end or good or some ultimate and supreme law. This is the common element among the diversity of theories. Some have held that the end is loyalty or obedience to a higher power or authority; and they have variously found this higher principle in Divine Will, the will of the secular ruler, the maintenance of institutions in which the purpose of superiors is embodied, and the rational consciousness of duty. But they have differed from one another because there was one point in which they were agreed: a single and final source of law. Others have asserted that it is impossible to locate morality in conformity to law-giving power, and that it must be sought in ends that are goods. And some have sought the good in self-realization, some in holiness, some in happiness, some in the greatest possible aggregate of pleasures. And yet these schools have agreed in the assumption that there is a single, fixed and final good. They have been able to dispute with one another only because of their common premise. The question arises whether the way out of the confusion and conflict is not to go to the root of the matter by questioning this common element. Is not the belief in the single, final and ultimate (whether conceived as good or as authoritative law) an intellectual product of that feudal organization which is disappearing historically and of that belief in a bounded, ordered cosmos, wherein rest is higher than motion, which has disappeared from natural science? It has been repeatedly suggested that the present limit of intellectual reconstruction lies in the fact that it has not as yet been seriously applied in the moral and social disciplines. Would not this further application demand precisely that we advance to a belief in a plurality of changing, moving, individualized goods and ends, and to a belief that principles, criteria, laws are intellectual instruments for analyzing individual or unique situations?