Interests of such magnitude and pervading importance as those involved in providing for a uniform standard of value throughout the Union were manifestly entitled to the protection of the national authority, and in view of the evils experienced for the want of such a standard during the war of the revolution, when the country was inundated with floods of depreciated paper, the members of the convention who framed the constitution did not hesitate to confide the power to congress, not only to coin money and regulate the value thereof, but also the power to regulate the value of foreign coin, which was denied to the congress of the confederation. Influenced by these considerations and others expressed in the opinion of the chief justice, this court decided in the case referred to, that the act of congress making the notes in question "lawful money and a legal tender in payment of debts" could not be vindicated as necessary and proper means for carrying into effect the power vested in congress to coin money and regulate the value thereof, or any other express power vested in congress under the constitution. Unless that case, therefore, is overruled, it is clear, in my judgment, that both the cases before the court are controlled by that decision. Controversies determined by the supreme court are finally and conclusively settled, as the decisions are numerous that the court cannot review and reverse their own judgments. But where the parties are different, it is said the court, in a subsequent case, may overrule a former decision, and it must be admitted that the proposition, in a technical point of view, is correct. Such examples are to be found in the reported decisions of the court, but they are not numerous, and it seems clear that the number ought never to be increased, especially in a matter of so much importance, unless the error is plain and upon the clearest convictions of judicial duty.