531US1 Unit: $$U9 [05-01-02 10:02:37] PAGES PGT: OPIN Cite as: 531 U. S. 98 (2000) 137 Ginsburg, J., dissenting should make him more competent, or conscientious, or learned with respect to [federal law] than his neighbor in the state courthouse.’ ” Stone v. Powell, 428 U. S. 465, 494, n. 35 (1976) (quoting Bator, Finality in Criminal Law and Federal Habeas Corpus for State Prisoners, 76 Harv. L. Rev. 441, 509 (1963)); see O’Dell v. Netherland, 521 U. S. 151, 156 (1997) (“[T]he Teague doctrine validates reasonable, good-faith interpretations of existing precedents made by state courts even though they are shown to be contrary to later decisions.”) (citing Butler v. McKellar, 494 U. S. 407, 414 (1990)); O’Connor, Trends in the Relationship Between the Federal and State Courts from the Perspective of a State Court Judge, 22 Wm. & Mary L. Rev. 801, 813 (1981) (“There is no reason to assume that state court judges cannot and will not provide a ‘hospitable forum’ in litigating federal constitutional questions.”). No doubt there are cases in which the proper application of federal law may hinge on interpretations of state law. Unavoidably, this Court must sometimes examine state law in order to protect federal rights. But we have dealt with such cases ever mindful of the full measure of respect we owe to interpretations of state law by a State’s highest court. In the Contract Clause case, General Motors Corp. v. Romein, 503 U. S. 181 (1992), for example, we said that although “ultimately we are bound to decide for ourselves whether a contract was made,” the Court “accord[s] respectful consideration and great weight to the views of the State’s highest court.” Id., at 187 (citing Indiana ex rel. Anderson v. Brand, 303 U. S. 95, 100 (1938)). And in Central Union Telephone Co. v. Edwardsville, 269 U. S. 190 (1925), we upheld the Illinois Supreme Court’s interpretation of a state waiver rule, even though that interpretation resulted in the forfeiture of federal constitutional rights. Refusing to supplant Illinois law with a federal definition of waiver,