BARRETT, Circuit Judge.

Ervin Ray Young (Young) appeals the dismissal of his habeas corpus application. Young's petition herein represents the ninth chapter of a continuing legal saga wherein he has attempted to overturn a murder conviction.

Young was convicted by a jury of murder on March 21, 1961. He was sentenced to life imprisonment on March 31, 1961. The Government's case was materially predicated on the testimony of Norma Sue Littlefield, who was an eyewitness when Young shot and killed her fiance.

Young alleged that he was denied a fair trial: (a) because of prejudicial and inflammatory remarks made by the prosecutor, (b) because the jury was improperly instructed, and (c) because the burden of proof was placed on him. In dismissing the application the Trial Court observed that it was Young's second habeas petition, that the first two allegations of error had been previously presented and determined adversely to him, and at that time they had not been presented to the State Court of Oklahoma. The Trial Court found that the first two contentions of error were later presented to the Oklahoma State Courts which "likewise ruled that no constitutional violations existed." The Trial Court also held that the evidence proffered by Young was not supportive of his third alleged violation, i.e., that the burden of proof had been placed on him.

On appeal Young contends that the Trial Court erred in: (1) permitting the prosecutor to express his personal opinion of Young's guilt; (2) instructing the jury on reasonable doubt; and (3) in refusing to "order in the trial records requested in appellant's Petition for Writ of Habeas Corpus Duces Tecum in which he complained about unconstitutional pre-trial investigations."

I.

Young contends that the Trial Court erred in permitting the prosecutor to express his personal opinion of Young's guilt during his summation:

MR. SIMMS (The Prosecutor):

* * * * * *

Gentlemen, I could go over this evidence, but I don't desire to repeat or take any more of your time, because I believe in my own mind and in my own heart to a moral certainty that Young is guilty.

MR. McARTHUR (Defense Counsel):

Now, Your Honor, we are going to object to that statement, invading the province of the jury, request the Court to admonish the jury not to consider it.

THE COURT: You should tell the jury that's based entirely upon this evidence.

MR. SIMMS: Yes, sir, based on the evidence, that's the way it seems to me. ____

We have held that statements expressing an advocate's personal belief in the merits of the case are to be deplored. Devine v. United States, 403 F.2d 93 (10th Cir. 1968), cert. denied 394 U.S. 1003, 89 S.Ct. 1599, 22 L.Ed.2d 780 (1969). This holding was clearly enunciated in United States v. Martinez, 487 F.2d 973 (10th Cir. 1973):

. . . we caution prosecuting attorneys that in their closing argument they should not, in an effort to bolster the credibility of a Government witness, place their own integrity, directly or indirectly, on the scales. Such is improper, and in the proper case may well result in a reversal which could have been easily avoided.

487 F.2d at 977.

See also United States v. Ludwig, 508 F.2d 140 (10th Cir. 1974), wherein we reversed a conviction because the prosecuting attorney, during closing argument, emphatically and personally vouched for the integrity of the state police force.

The standard has been recently treated by the United States Supreme Court in Donnelly v. DeChristoforo, 416 U.S. 637, 94 S.Ct. 1868, 40 L.Ed.2d 431 (1974). In that case the prosecuting attorney stated during summation:

. . . [they] hope that you find him not guilty. I quite frankly think that they hope that you find him guilty of something a little less than first-degree murder.

There, as here, the jury was instructed to disregard comments of counsel that were not in evidence. In holding that the remarks did not give rise to constitutional error, the Court stated:

. . . not every trial error or infirmity which might call for application of supervisory powers correspondingly constitutes a "failure to observe that fundamental fairness essential to the very concept of justice." Lisenba v. California, 314 U.S. 219, 236, 62 S.Ct. 280, 86 L.Ed. 166 (1941).

416 U.S. at 642, 94 S.Ct. at 1871.

* * * * * *

The "consistent and repeated misrepresentation" of a dramatic exhibit in evidence may profoundly impress a jury and may have a significant impact on the jury's deliberations. Isolated passages of a prosecutor's argument, billed in advance to the jury as a matter of opinion not of evidence, do not reach the same proportions. Such arguments, like all closing arguments of counsel, are seldom carefully constructed in toto before the event; improvisation frequently results in syntax left imperfect and meaning less than crystal clear. While these general observations in no way justify prosecutorial misconduct, they do suggest that a court should not lightly infer that a prosecutor intends an ambiguous remark to have its most damaging meaning or that a jury, sitting through lengthy exhortation, will draw that meaning from the plethora of less damaging interpretations. (Emphasis supplied).

416 U.S. at 646-647, 94 S.Ct. at 1873.

Applying this standard, we hold that, under the facts of this case, the prosecutor's comment did not give rise to constitutional error.

II.

Young contends that the Trial Court committed reversible error when it defined "reasonable doubt." The instruction provided, in part:

When all the evidence in the case, carefully analyzed, compared and weighed by you, produces in your minds a settled conviction or belief of the defendant's guilt, such a conviction as you would be willing to act upon in matters of highest importance relating to your own affairs, when it leaves your minds in an abiding conviction amounting to a moral certainty of the truth of the charge, then, and in that event you would be free from a reasonable doubt.

Young cites Templer v. State, 494 P.2d 667 (Okl.Ct.Crim.App. 1972), decided eleven years following his conviction, for the proposition that instructions defining reasonable doubt should not be given and that such an instruction can give rise to reversible error. Other cases are cited supportive of this contention.

In determining whether a particular instruction submitted to the jury gives rise to reversible error, we must view such instruction as part of a totality of the entire instructions given. United States v. Smaldone, 485 F.2d 1333 (10th Cir. 1973), cert. denied 416 U.S. 936, 94 S.Ct. 1934, 40 L.Ed.2d 286; (1974) United States v. Fletcher, 444 F.2d 619 (10th Cir. 1971); Devine v. United States, supra. The necessity of avoiding an isolated review of a particular instruction was recently discussed in Cupp v. Naughten, 414 U.S. 141, 94 S.Ct. 396, 38 L.Ed.2d 368 (1973):

In determining the effect of this instruction on the validity of respondent's conviction, we accept at the outset the well-established proposition that a single instruction to a jury may not be judged in artificial isolation, but must be viewed in the context of the overall charge. Boyd v. United States, 271 U.S. 104, 107, [ 46 S.Ct. 442, 443, 70 L.Ed.2d 857] (1926). While this does not mean that an instruction by itself may never rise to the level of a constitutional error, see Cool v. United States, 409 U.S. 100, [ 93 S.Ct. 354, 34 L.Ed.2d 335] (1972), it does recognize that a judgment of conviction is commonly the culmination of a trial which includes testimony of witnesses, argument of counsel, receipt of exhibits in evidence, and instruction of the jury by the judge. Thus not only is the challenged instruction but one of many such instructions, but the process of instruction itself is but one of several components of the trial which may result in the judgment of conviction.

414 U.S. at 146-147, 94 S.Ct. at 400.

In Cupp the Court further cautioned:

Before a federal court may overturn a conviction resulting from a state trial in which this instruction was used, it must be established not merely that the instruction is undesirable, erroneous, or even "universally condemned," but that it violated some right which was guaranteed to the defendant by the Fourteenth Amendment.

414 U.S. at 146, 94 S.Ct. at 400.

Young has not shown that the "reasonable doubt" instruction herein complained of violated a right guaranteed him by the Fourteenth Amendment. We thus hold that the State Trial Court did not commit reversible error.

III.

Young contends that the Trial Court erred in refusing to "order in the Trial records requested in appellant's Petition for Writ of Habeas Corpus Duces Tecum in which he complained about unconstitutional pre-trial investigations." Since there were no factual issues alleged in the habeas application which would render it necessary for the Federal Trial Judge to examine the State trial transcript, constituting allegations giving rise to any federal constitutional violations, we hold that the Trial Court did not err in refusing to order in the transcripts.

The relevancy and materiality of evidence are matters within the sound discretion of the Trial Court. That judgment will not be disturbed on appeal unless there is a clear showing of abuse of discretion. United States v. Ray, 488 F.2d 15 (10th Cir. 1973); United States v. Twilligear, 460 F.2d 79 (10th Cir. 1972). The bald allegations of alleged "unconstitutional" pre-trial investigations are here presented in a vacuum, rising no higher than possible, conjectural or speculative prejudice, none of which warrant reversal, where, as here, the evidence of guilt is strong. United States v. Harpel, 493 F.2d 346 (10th Cir. 1974); United States v. Jackson, 482 F.2d 1167 (10th Cir. 1973), cert. denied 414 U.S. 1159, 94 S.Ct. 918, 39 L.Ed.2d 111 (1974).

Affirmed.