The inadequacy of the single individual, the need of association, is the basis and cause of man's consideration for his neighbor, of morality. Now since the one who feels this need, man, is necessarily an individual, it follows that his need must likewise be individual and more or less intensive. And since my neighbors are necessarily different from me, it requires different considerations to meet their needs. Concrete man needs a concrete morality. Just as abstract and meaningless as the concept of mankind in general is that of absolute morality, and the ethical laws derived from this vague idea are quite as unpractical and unsuccessful. Man is a living personality, whose welfare and purpose is embodied within himself, who has between himself and the world nothing but his needs as a mediator, who owes no allegiance to any law whatever from the moment that it contravenes his needs. The moral duty of an individual never exceeds his interests. The only thing which exceeds those interests is the _material power_ of the generality over the individuality. If we regard it as the function of reason to ascertain that which is morally right, a uniform scientific result may be produced if we agree at the outset on the persons, conditions, or limits within which the universal moral right is to be determined; in other words, we may accomplish something practical if we drop the idea of absolute right and search for definite rights applicable to well-defined purposes by clearly stating our problem. The contradiction in the various standards of morality, and the many opposing solutions of this contradiction, are due to a misunderstanding of the problem. To look for right without a given quantity of sense perceptions, without some definite working material, is an act of speculative reason which pretends to explore nature without the use of senses. The attempt to arrive at a positive determination of morality by pure perception and pure reason is a manifestation of the philosophical faith in understanding _a priori_. "It is true," said Macaulay in his History of England, in speaking of the rebellion against the lawless and cruel government of James II., "that to trace the exact boundary between rightful and wrongful resistance is impossible: but this impossibility arises from the nature of right and wrong, and is found in every part of ethical science. A good action is not distinguished from a bad action by marks so plain as those which distinguish a hexagon from a square. There is a frontier where virtue and vice fade into each other. Who has ever been able to define the exact boundary between courage and rashness, between prudence and cowardice, between frugality and avarice, between liberality and prodigality? Who has ever been able to say how far mercy to offenders ought to be carried, and where it ceases to deserve the name of mercy and becomes a pernicious weakness?"