لَيْسَ مِنْ أَسْبَابِ الْمَعْرِفَةِ بِصِحَّةِ الشَّيْءِ عِنْدَ أَهْلِ الْحَقِّ
Among the scholars of the true doctrine, inspiration is not one of the general means for establishing that something is correct.
The scope of this statement matters. It need not deny that a correct understanding may sometimes arise through inspiration. It denies that an inward occurrence alone constitutes an independent, publicly checkable and binding proof for other people.
Someone could claim an inward disclosure commanding a judgment for or against another person. Others cannot inspect that disclosure through their senses or infer its truth from a necessary rational connection. Treating the claim alone as decisive evidence would go beyond the established methods of proof.