صدر الدين محمد بن ابراهيم الشيرازي · Ṣadr al-Dīn Muḥammad ibn Ibrāhīm al-Shīrāzī
Mullā Ṣadrā founded "al-ḥikma al-mutaʿāliya" (Transcendent Theosophy), synthesizing Avicennan Peripatetic philosophy, Suhrawardī's Illuminationism, Ibn 'Arabī's mysticism, and Twelver Shia theology. His central doctrine, the primacy of existence (aṣālat al-wujūd), holds that existence alone is the single, graded, dynamically intensifying reality, while essences are merely mental abstractions of its modes, and he paired this with "substantial motion" (ḥaraka jawhariyya), on which even substances, not only their accidents, undergo continuous processual change.
Intellectual setting
Mullā Ṣadrā wrote in Safavid Iran amid a flourishing of philosophical theology that sought to integrate rational philosophy with Twelver Shia doctrine, drawing together previously distinct Peripatetic, Illuminationist, and mystical traditions into a single systematic framework.
Key ideas
The primacy of existence (aṣālat al-wujūd)
Mullā Ṣadrā argued that existence (wujūd) is the sole concrete reality, admitting of intensity and gradation, while essences (māhiyyāt) are mere mental abstractions derived from its particular modes of manifestation, reversing the priority earlier philosophers had often given to essence.
Substantial motion (ḥaraka jawhariyya)
Mullā Ṣadrā argued that continuous change characterizes the very substance of things, not merely their accidental properties, providing a dynamic ontology that underlies his account of the soul's development toward the afterlife.
Legacy
Mullā Ṣadrā's Transcendent Theosophy became the dominant philosophical school in Twelver Shia Iran from the Qajar era onward and remains central to contemporary Islamic philosophical education, especially in Iran.