An early decision in Massachusetts (Loomis v. Newhall[Footnote: 15 Pickering's Reports, 159.]) had affirmed the position that if a statute required contracts of a certain kind to be put in writing, and a contract of that kind, but embracing also a different and distinct matter not touched by the statute, was made orally, it was wholly void. Such a rule was illogical and unsound, and in a later decision the same court, forgetting that it had indorsed it, said so, and said so when it was not necessary to the decision.[Footnote: Irvine v. Stone, 6 Cushing's Reports, 508, 510.] Subsequently, both these cases having been brought to its attention, it affirmed the latter, though remarking that "what was there said on this point was not essential to the decision of that case, and would have been omitted or modified if Loomis v. Newhall had been then remembered."[Footnote: Rand v. Mather, 11 Cushing's Reports, 1, 5.]
The authority of an opinion as a precedent on any point is always proportioned to the necessity of determining that point in order to support the judgment which was rendered. Some judges write treatises instead of decisions or in addition to decisions. Whatever goes beyond that which is required to show that the judgment is the legal conclusion from the ascertained facts is styled in law language obiter dictum. It may be interesting and even persuasive, but it is not an authoritative statement of law.
It may grow to be such by adoption in subsequent cases. The Court of King's Bench in England was called on, at the beginning of the eighteenth century, to say whether if a man undertook as a friendly act, and not for pay, to cart another's goods, and did it carelessly, he was bound to answer for any damage that might result. There were four judges who heard the case, of whom three gave their opinions.[Footnote: Coggs v. Bernard, Lord Raymond's Reports, 909.] Two of these opinions were confined to the precise point of law on which the case turned. In the third, Chief Justice Holt seized the opportunity to lay down the law of England as to all sorts of contracts arising out of the reception by one man of the goods of another. This he did mainly by setting forth what were the rules of the Roman law on the subject, but not referring to their Roman origin, and quoting them, so far as he could, from Bracton, an English legal writer of the thirteenth century, who had also stated them as English law.
For four or five centuries these rules had been laid down in an unofficial treatise, but the courts had not fully recognized them. Now the Chief Justice of England had given such recognition in the amplest manner. Meanwhile the trade of England had reached a point at which some definite rules on all these matters had become of the utmost importance. The bar were only too glad to advise their clients in accordance with Lord Holt's opinion. It was not long before it was universally practiced upon, and no case in the English language touching contract relations of that nature is of greater importance as a precedent. Yet it became such not because of its intrinsic authority as a judgment, so much as on account of its orderly and scientific statement of a whole body of law of a kind that the people needed and for the origin of which—whether at Rome or London—they cared little, so long as it had been accepted by the highest judicial authority in the realm.
On the other hand, the greatest judges have often, in delivering the opinion of the court, asserted doctrines the consideration of which was not essential to the decision, and later retracted the assertion on fuller consideration or seen the court in a later case retract it for them.
Two of the great opinions of Chief Justice Marshall are Marbury v. Madison[Footnote: 1 Cranch's Reports, 137.] and Cohens v. Virginia.[Footnote: 6 Wheaton's Reports, 264.] In the first the court held that it had no jurisdiction to command the Secretary of State to deliver a commission executed under the preceding administration, because, although Congress had assumed to confer it, Congress had no power to do so; and in defending this position Marshall observed that the Constitution defined the jurisdiction of the Supreme Court over cases brought there in the first instance, and that in this clause of the Constitution affirmative words had the force of negative words so far as to exclude jurisdiction over any other cases than those specifically mentioned. In the second case this observation was relied on by Virginia to defeat the power of the court to review a State judgment. But, said the Chief Justice, "it is a maxim not to be disregarded that general expressions in every opinion are to be taken in connection with the case in which those expressions are used. If they go beyond the case they may be respected, but ought not to control the judgment in a subsequent suit when the very point is presented for decision…. In the case of Marbury v. Madison, the single question before the court, so far as that case can be applied to this, was whether the legislature could give this court original jurisdiction in a case in which the Constitution had clearly not given it, and in which no doubt respecting the construction of the article could possibly be raised. The court decided, and we think very properly, that the legislature could not give original jurisdiction in such a case. But in the reasoning of the court in support of this decision some expressions are used which go far beyond it…. The general expressions in the case of Marbury v. Madison must be understood with the limitations which are given to them in this opinion; limitations which in no degree affect the decision in that case or the tenor of its reasoning." He then proceeded to dispose of the case in hand by saying that Virginia having obtained an erroneous judgment against Cohens, Cohens had a right to appeal, and the suit still remained a suit by a State against him and not by him against a State. Unfortunately, here again came in next an obiter dictum. If, he said, this were not so, there was another principle equally decisive in support of the jurisdiction, namely, that the Constitution gave the United States judicial power over all cases arising under the Constitution or laws of the United States without respect to parties. Nearly a hundred years later a State was sued in the courts of the United States on a cause of action arising under the Constitution, and Cohens v. Virginia was relied on as a precedent. "It must be conceded," was the reply of the Supreme Court, "that the last observation of the Chief Justice does favor the argument of the plaintiff. But the observation was unnecessary to the decision, and in that sense extra-judicial, and though made by one who seldom used words without due reflection, ought not to outweigh the important considerations referred to which lead to a different conclusion."[Footnote: Hans v. Louisiana, 134 United States Reports, 1, 20.]
It may be added that decisions on a point not material to the cause are generally made without the benefit of previous argument by counsel. The lawyers will naturally address themselves to the controlling questions, and if well trained will see what these are quite as clearly as the court. It is the argument at the bar, in which different views of law are presented and each defended by men of learning and ability, which enables the judge, after hearing both sides and weighing all that is said in behalf of one against all that is said in behalf of the other, to come to the true conclusion. The Romans recognized this in their rule as to the force of precedent in a matter of customary law. The first thing to ask was whether "contradicto aliquando judicio consuetudo firmata sit."[Footnote: "Digest," 1, 3, de legibus, etc., 34.]
The retrospective effect which a refusal to follow a former decision may have in disturbing vested rights being one of the most cogent reasons for adhering to precedent, there is less objection to departing from it when the decision can be so limited as to have only a future operation. This is occasionally feasible. Thus the High Court of Errors and Appeals of Mississippi by an early decision held that on the dissolution of a bank all its rights and liabilities were extinguished. Thirty years later the Supreme Court of the same State overruled that decision, declaring it "condemned by reason and the principles of modern and enlightened jurisprudence," but nevertheless applied it as a controlling precedent to a case arising out of the dissolution of a bank which had been incorporated previously to the time when the original decision was made.[Footnote: 1 Bank of Mississippi v. Duncan, 56 Mississippi Reports, 165.]
The effect of overruling a former opinion may also be limited by the dual character of our government.
The courts of the United States follow the decisions of the State courts in the determination of matters of State law. If a State law is held by the courts of the State to have a particular meaning and effect it will be accorded the same in the federal courts. But if a federal judgment is for that reason rendered in a certain form, and there is no appeal, it settles the rights of the parties to the suit forever, even should the State courts afterward reverse their former rulings as being erroneous.[Footnote: 2 Deposit Bank v. Frankfort, 191 United States Reports, 499.]