Handy dandy federalism quotes

"[T]he constitution of the United States is one of limited and expressly delegated powers, which can only be exercised as granted, or in the cases enumerated. This principle, which distinguishes the national from the State governments, is derived from the nature of the constitution itself, as being a delegation of power, and not a restriction of power previously possessed; and from the express stipulation in the 10th amendment, that 'the powers not delegated to the United States by the constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.' The national constitution must, therefore, be construed strictly, as regards the powers expressly granted, and the objects to which those powers are to be applied. As it is a grant of power in derogation of State sovereignty, every portion of power, not granted, must remain in the State Legislature. Gibbons v. Ogden, 22 U.S. 1, 33 (1824).
(footnotes omitted)

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“The powers delegated by the proposed Constitution to the federal government are few and defined. Those which are to remain in the State governments are numerous and indefinite.” The Federalist No. 45, p. 292-293 (C. Rossiter ed. 1961).

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“In the compound republic of America, the power surrendered by the people is first divided between two distinct governments, and then the portion allotted to each subdivided among the distinct and separate departments. Hence a double security arises to the rights of the people. The different governments will control each other, at the same time that each will be controlled by itself.” The Federalist No. 51, p. 323 (C. Rossiter ed. 1961) (J. Madison).

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“[T]he scope of the interstate commerce power must be considered in the light of our dual system of government [because to do otherwise] would effectually obliterate the distinction between what is national and what is local and create a completely centralized government.” (internal citations and quotation marks omitted). United States v. Morrison, 529 U.S. 598 (2000).

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“Just as the separation and independence of the coordinate branches of the Federal Government serve to prevent the accumulation of excessive power in any one branch, a healthy balance between federal and state power lies at the heart of liberty.” Gregory v. Ashcroft, 501 U.S. 452, 458-459 (1991).

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I have dozens more if you care to see them.