The barzakh development of the human soul is a dynamic philosophical-mystical essence enabling intuitive spiritual conduct and real existential intensification (transformation at the level of being, not merely perceptual deepening) across divine manifestation. This study uses an analytical-demonstrative approach, integrating Ibn ʿArabī’s theoretical mysticism (unity of existence, imaginal forms, barzakh as isthmus of manifestations) with Mulla Ṣadrā’s transcendental philosophy (substantial motion, gradation of existence, imaginal abstraction) to resolve the conflict between the explicit denial of barzakh development in some Asfār passages and the possibility of passive soul progression.

The main challenges—the need for a material substrate in substantial motion and seeming inconsistency in Ṣadrā’s statements—are addressed by distinguishing passive conduct (existential intensification in the imaginal realm and union with divine theophanies) from voluntary conduct (limited to the material world and terminated by death), interpreting barzakh as an intermediate ontological level of the soul. Comparison with Avicenna, Suhrawardī, and Western philosophers underscores the comprehensiveness of Ṣadrian philosophical mysticism.

Main finding: Barzakh evolution is a genuine existential transformation, not mere intuitive deepening. This interpretation is preferred for superior coherence with substantial motion, imaginal abstraction, and scriptural evidence (embodiment of acts). Contemporary implications connect to existentialist philosophy, comparative theology, and intuitive psychology.