Cite as: 511 U. S. 1 (1994)
Opinion of Ginsburg, J.
"[T]he government has the burden of proving the defendant guilty beyond a reasonable doubt. Some of you may have served as jurors in civil cases, where you were told that it is only necessary to prove that a fact is more likely true than not true. In criminal cases, the government's proof must be more powerful than that. It must be beyond a reasonable doubt.
"Proof beyond a reasonable doubt is proof that leaves you firmly convinced of the defendant's guilt. There are very few things in this world that we know with absolute certainty, and in criminal cases the law does not require proof that overcomes every possible doubt. If, based on your consideration of the evidence, you are firmly convinced that the defendant is guilty of the crime charged, you must find him guilty. If on the other hand, you think there is a real possibility that he is not guilty, you must give him the benefit of the doubt and find him not guilty." Federal Judicial Center, Pattern Criminal Jury Instructions, at 17-18 (instruction 21).
This instruction plainly informs the jurors that the prosecution must prove its case by more than a mere preponderance of the evidence, yet not necessarily to an absolute certainty. The "firmly convinced" standard for conviction, repeated for emphasis, is further enhanced by the juxtaposed prescription that the jury must acquit if there is a "real possibility" that the defendant is innocent. This model instruction surpasses others I have seen in stating the reasonable doubt standard succinctly and comprehensibly.
I recognize, however, that this Court has no supervisory powers over the state courts, see ante, at 17, and that the test we properly apply in evaluating the constitutionality of a reasonable doubt instruction is not whether we find it exemplary; instead, we inquire only whether there is a "reasonable likelihood that the jury understood the instructio[n] to allow conviction based on proof insufficient to meet" the rea-
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