Page:Joseph Story, Commentaries on the Constitution of the United States (1st ed, 1833, vol I).djvu/460

 420 thing? What is the ability to do a thing, but the power of employing the means necessary to its execution? What is a legislative power, but a power of making laws? What are the means to execute a legislative power, but laws? No axiom, indeed, is more clearly established in law or in reason, than that, where the end is required, the means are authorized. Whenever a general power to do a thing is given, every particular power necessary for doing it is included. In every new application of a general power, the particular power, which are the means of attaining the object of the general power, must always necessarily vary with that object; and be often properly varied, whilst the object remains the same. Even under the confederation, where the delegation of authority was confined to express powers, the Federalist remarks, that it would be easy to show, that no important power delegated by the articles of confederation had been, or could be, executed by congress, without recurring more or less to the doctrine of construction or implication!

§ 435. XII. Another point, in regard to the interpretation of the constitution, requires us to advert to the rules applicable to cases of concurrent and exclusive powers. In what cases are the powers given to the general government exclusive, and in what cases may the states maintain a concurrent exercise? Upon this subject we have an elaborate exposition by the authors of the Federalist; and as it involves some of the most delicate questions growing out of the constitution, and those, in which a conflict with the states is most likely to arise, we cannot do better than to quote the reasoning.