As an illustration, the statement «إِنَّ الْإِسْلَامَ حَقٌّ» could reinforce a claim to a denier. Yet «الْإِسْلَامُ حَقٌّ» may be used without such reinforcement when the supporting evidence is conspicuous. This is an explanatory application of the source rule.
Omitting emphasis does not necessarily mean weak conviction. It can signal that the truth is sufficiently manifest and should not require further verbal reinforcement against denial.
Thus ʿIlm al-Maʿānī does not prescribe the same formal reply to every denier. The speaker considers available evidence, the listener’s stance, and the intended rhetorical effect together.