ما إن تأمله
Something which, if reflected upon, would have this effect.
The source’s word taʾammul (reflection) is important. The mere presence of evidence, the effort to understand it, and a changed judgment are not identical. A denier may have evidence before them but fail to engage with it.
Evidence available: reasons are present to be considered.
Reflection: the relation of the argument to the conclusion is examined.
Expected outcome: the reason for denial should weaken or disappear. This describes the rhetorical premise rather than claiming direct knowledge of another person’s mind.