Summary

by John Marshall Cohens v. Virginia — Opinion of the Court

But, should no appeal be made to force, the States can put an end to the government by refusing to act. They have only not to elect Senators, and it expires without a struggle.
It is very true that, whenever hostility to the existing system shall become universal, it will be also irresistible. The people made the constitution, and the people can unmake it. It is the creature of their will, and lives only by their will. But this supreme and irresistible power to make or to unmake, resides only in the whole body of the people
Source: Wikisource

by John Marshall Cohens v. Virginia — Opinion of the Court

It is most true that this Court will not take jurisdiction if it should not: but it is equally true, that it must take jurisdiction if it should. The judiciary cannot, as the legislature may, avoid a measure because it approaches the confines of the constitution. We cannot pass it by because it is doubtful. With whatever doubts, with whatever difficulties, a case may be attended, we must decide it, if it be brought before us. We have no more right to decline the exercise of jurisdiction which is given, than to usurp that which is not given.
Source: Wikisource

by John Marshall Cohens v. Virginia — Opinion of the Court

Let us suppose one of the most glaring violations of the constitution; a bill of attainder of ex post facto law, for example, passed by a State; and that the State judiciary proceeds to conviction of the party prosecuted. Let us suppose, that this Court, claiming an appellate jurisdiction, forbids the execution of the party; but the State Court orders its judgment to be executed, and it is executed, by putting to death the prisoner. His life cannot be recalled: that is beyond the reach of human power; can you prosecute the judges or the officer for murder?
Source: Wikisource

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