Summary

Portrait of John Marshall John Marshall Marbury v. Madison — Opinion of the Court

The question whether an act repugnant to the Constitution can become the law of the land is a question deeply interesting to the United States, but, happily, not of an intricacy proportioned to its interest. It seems only necessary to recognise certain principles, supposed to have been long and well established, to decide it.
That the people have an original right to establish for their future government such principles as, in their opinion, shall most conduce to their own happiness is the basis on which the whole American fabric has been erected.
Source: Wikisource

Portrait of John Marshall John Marshall Marbury v. Madison — Opinion of the Court

It is emphatically the province and duty of the Judicial Department 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. [p178]
So, if a law be in opposition to the Constitution, if both the law and the Constitution apply to a particular case, so that the Court must either decide that case conformably to the law, disregarding the Constitution, or conformably to the Constitution, disregarding the law, the Court must determine which of these conflicting rules governs the case.
Source: Wikisource

Portrait of John Marshall John Marshall Marbury v. Madison — Opinion of the Court

It is scarcely necessary for the Court to disclaim all pretensions to such a jurisdiction. An extravagance so absurd and excessive could not have been entertained for a moment. The province of the Court is solely to decide on the rights of individuals, not to inquire how the Executive or Executive officers perform duties in which they have a discretion. Questions, in their nature political or which are, by the Constitution and laws, submitted to the Executive, can never be made in this court.
Source: Wikisource

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