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Quotation from Marbury v. Madison by Supreme Court of the United States
“It is emphatically the province and duty of the Judicial Department to say what the law is.”
Marbury v. Madison, Opinion of the Court (Marshall, C.J.), on the third question (U.S. Reports text (Wikisource))

Chief Justice Marshall states why courts deciding particular cases must determine which of two conflicting rules governs.
Citation: "It is emphatically the province and duty of the Judicial Department to say what the law is." — Supreme Court of the United States, Marbury v. Madison, Opinion of the Court (Marshall, C.J.), on the third question (U.S. Reports text (Wikisource)). (id marbury-v-madison-q1)
Portrait: John Marshall by Henry Inman, 1832, Henry Inman, Public domain.
