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.