 Mullā Ṣadrā can be regarded as the reviver of the authentic mystical wisdom to be attained through mysticism and the intellectual intuition not divorced from rationality. Mullā Ṣadrā makes extensive use of logical analyses and demonstrative proofs, which rest on what he calls “illuminative principle” (qā‘idah ishraqiyyah); that is, what has entered the heart (al-varidāt al-qalbiyyah), or “Divinely realized knowledge” (taḥqīq ‘arshī).