Without adverting to the particular theories to which the federal compact has given rise, both as to its formation and the parties to it, and without inquiring whether it be merely federal or social or national, it is sufficient that it must be admitted to be a compact and to possess the obligations incident to a compact; to be "a compact by which power is created on the one hand and obedience exacted on the other; a compact freely, voluntarily, and solemnly entered into by the several States and ratified by the people thereof, respectively; a compact by which the several States and the people thereof, respectively, have bound themselves to each other and to the Federal Government, and by which the Federal Government is bound to the several States and to every citizen of the United States." To this compact, in whatever mode it may have been done, the people of South Carolina have freely and voluntarily given their assent, and to the whole and every part of it they are, upon every principle of good faith, inviolably bound. Under this obligation they are bound and should be required to contribute their portion of the public expense, and to submit to all laws made by the common consent, in pursuance of the Constitution, for the common defense and general welfare, until they can be changed in the mode which the compact has provided for the attainment of those great ends of the Government and of the Union. Nothing less than causes which would justify revolutionary remedy can absolve the people from this obligation, and for nothing less can the Government permit it to be done without violating its own obligations, by which, under the compact, it is bound to the other States and to every citizen of the United States. These deductions plainly flow from the nature of the federal compact, which is one of limitations, not only upon the powers originally possessed by the parties thereto, but also upon those conferred on the Government and every department thereof. It will be freely conceded that by the principles of our system all power is vested in the people, but to be exercised in the mode and subject to the checks which the people themselves have prescribed. These checks are undoubtedly only different modifications of the same great popular principle which lies at the foundation of the whole, but are not on that account to be less regarded or less obligatory. Upon the power of Congress, the veto of the Executive and the authority of the judiciary, which is to extend to all cases in law and equity arising under the Constitution and laws of the United States made in pursuance thereof, are the obvious checks, and the sound action of public opinion, with the ultimate power of amendment, are the salutary and only limitation upon the powers of the whole.