The case of _Marbury_ v. _Madison_, however, has a much deeper significance for constitutional history. Having asserted the right of Marbury to his commission, the court disappointed expectations by refusing to issue the writ of _mandamus_, on the ground that the power to issue such writs was not conferred by the Constitution upon the Supreme Court as part of its original jurisdiction. And as the Judiciary Act of 1789 had conferred this authority, the court was impelled to declare this provision of the act unwarranted by the Constitution and therefore void. For the first time the Supreme Court asserted its power to pronounce an act of Congress repugnant to the Constitution not to be law, but void and of no effect. In substantiating its position, the court did not inquire into the difficult question whether the framers of the Constitution intended or expected the national judiciary to exercise this authority. It was enough for the purposes of the court that the Constitution was the supreme and paramount law of the land, established by the people of the United States. The Constitution defines and limits the powers of government it must then control any legislative act repugnant to it. "Certainly all those who have framed written constitutions contemplate them as forming the fundamental and paramount law of the nation, and, consequently, the theory of every such government must be, that an act of the legislature, repugnant to the constitution, is void." With equal certitude the court declared that it was the province and duty of the judiciary to say what the law is. "Those who apply the rule to particular cases, must of necessity expound and interpret that rule. If two laws conflict with each other, the courts must decide on the operation of each." So if a law stood in opposition to the Constitution, the court must decide which of these conflicting rules governs the case. "This is of the very essence of judicial duty." Moreover, the judges may not shut their eyes to the Constitution and see only the law, for they are bound by oath to administer justice not according to the laws alone, but "agreeably to the Constitution and the laws of the United States." "Thus, the particular phraseology of the Constitution of the United States confirms and strengthens the principle, supposed to be essential to all written constitutions, that a law repugnant to the Constitution is void; and that courts, as well as other departments, are bound by that instrument."