How to obtain consistent glitches behaviour?

I am using clock glitching to understand vulnerable points in the code. However, when I repeat the glitch settings, its not necessary that I get the same result(a successful glitch). How to avoid that?

Any advice please about this topic?

If I understand the concept in a wrong way can you please correct me?

That’s just the nature of fault injection. From
“in practice, the best we can hope for are ways of causing useful faults some of the time”

page is not found sorry. can you please add it again

The quote is from chapter 4.