Cite as: 558 U. S. ____ (2010) 7 ROBERTS, C. J., concurring Jackson explained, this requires a “sober appraisal of the disadvantages of the innovation as well as those of the questioned case, a weighing of practical effects of one against the other.” Jackson, Decisional Law and Stare Decisis, 30 A. B. A. J. 334 (1944). In conducting this balancing, we must keep in mind that stare decisis is not an end in itself. It is instead “the means by which we ensure that the law will not merely change erratically, but will develop in a principled and intelligible fashion.” Vasquez v. Hillery, 474 U. S. 254, 265 (1986). Its greatest purpose is to serve a constitutional ideal—the rule of law. It follows that in the unusual circumstance when fidelity to any particular precedent does more to damage this constitutional ideal than to advance it, we must be more willing to depart from that precedent. Thus, for example, if the precedent under consideration itself departed from the Court’s jurisprudence, returning to the “ ‘intrinsically sounder’ doctrine established in prior cases” may “better serv[e] the values of stare decisis than would following [the] more recently decided case inconsis tent with the decisions that came before it.” Adarand Constructors, Inc. v. Peña, 515 U. S. 200, 231 (1995); see also Helvering, supra, at 119; Randall, supra, at 274 (STEVENS, J., dissenting). Abrogating the errant prece dent, rather than reaffirming or extending it, might better preserve the law’s coherence and curtail the precedent’s disruptive effects. Likewise, if adherence to a precedent actually impedes the stable and orderly adjudication of future cases, its stare decisis effect is also diminished. This can happen in a number of circumstances, such as when the precedent’s validity is so hotly contested that it cannot reliably func tion as a basis for decision in future cases, when its ra tionale threatens to upend our settled jurisprudence in related areas of law, and when the precedent’s underlying