defense counsel failed to preserve these matters for review, for he neither objected to those parts of the argument nor raised the point in his post-trial motion. But because the defendant also argues that the procedural default would constitute ineffective assistance of counsel, we shall examine the question on its merits.
Generally, it is improper to vouch for the credibility of a witness or to express a personal opinion on a case. (People v. Johnson (1986), 114 Ill. 2d 170, 198; People v. Hoffman (1948), 399 Ill. 57, 64-66; see United States v. Young (1985), 470 U.S. 1, 84 L. Ed. 2d 1, 105 S. Ct. 1038.) Comments on the strength of the evidence are permitted, however. (People v. Yates (1983), 98 Ill. 2d 502, 532; People v. Tiller (1982), 94 Ill. 2d 303, 319.) We believe that the remarks complained of here, set out below, were either fair comments on the evidence or, viewed in context, did not amount to personal opinions regarding the strength of the State’s case.
The defendant first complains of the comment, “We know Robert Ray was telling you the truth.” After describing the condition of the building following the fire and the point of origin of the fire, the prosecutor said:
“And we know Robert Ray was telling you the truth. We could tell. You tell by the way the man told you what happened that he was telling you the truth.” (Emphasis added.)
With this remark the prosecutor evidently sought to emphasize the favorable impression created by the Robert Ray’s demeanor during his testimony. The prosecutor’s remark correctly foreshadowed the jury instruction on the credibility of witnesses. “In considering the testimony of any witness, you may take into account his manner while testifying .” Illinois Pattern Jury Instructions, Criminal, No. 1.02 (2d ed. 1981).