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B.: What is Right? - Immanuel Kant, The Philosophy of Law: An Exposition of the Fundamental Principles of Jurisprudence as the Science of Right 
The Philosophy of Law: An Exposition of the Fundamental Principles of Jurisprudence as the Science of Right, by Immanuel Kant, trans. W. Hastie (Edinburgh: Clark, 1887).
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What is Right?
This question may be said to be about as embarrassing to the Jurist as the well-known question, ‘What is Truth?’ is to the Logician. It is all the more so, if, on reflection, he strives to avoid tautology in his reply, and recognise the fact that a reference to what holds true merely of the laws of some one country at a particular time, is not a solution of the general problem thus proposed. It is quite easy to state what may be right in particular cases (quid sit juris), as being what the laws of a certain place and of a certain time say or may have said; but it is much more difficult to determine whether what they have enacted is right in itself, and to lay down a universal Criterion by which Right and Wrong in general, and what is just and unjust, may be recognised. All this may remain entirely hidden even from the practical Jurist until he abandon his empirical principles for a time, and search in the pure Reason for the sources of such judgments, in order to lay a real foundation for actual positive Legislation. In this search his empirical Laws may, indeed, furnish him with excellent guidance; but a merely empirical system that is void of rational principles is, like the wooden head in the fable of Phædrus, fine enough in appearance, but unfortunately it wants brain.
1. The conception of Right,—as referring to a corresponding Obligation which is the moral aspect of it,—in the first place, has regard only to the external and practical relation of one Person to another, in so far as they can have influence upon each other, immediately or mediately, by their Actions as facts. 2. In the second place, the conception of Right does not indicate the relation of the action of an individual to the wish or the mere desire of another, as in acts of benevolence or of unkindness, but only the relation of his free action to the freedom of action of the other. 3. And, in the third place, in this reciprocal relation of voluntary actions, the conception of Right does not take into consideration the matter of the act of Will in so far as the end which any one may have in view in willing it, is concerned. In other words, it is not asked in a question of Right whether any one on buying goods for his own business realizes a profit by the transaction or not; but only the form of the transaction is taken into account, in considering the relation of the mutual acts of Will. Acts of Will or voluntary Choice are thus regarded only in so far as they are free, and as to whether the action of one can harmonize with the Freedom of another, according to a universal Law.
Right, therefore, comprehends the whole of the conditions under which the voluntary actions of any one Person can be harmonized in reality with the voluntary actions of every other Person, according to a universal Law of Freedom.