 His magnum opus, The Four Journeys of the Intellect (al-Asfār al-arba‘āt al-‘aqliyyah) is a philosophical and gnostic exposition of the highest caliber, in which the descending and ascending journey of the soul from and to God is treated in detail. This work, which is an encyclopedia of gnosis, philosophy, and mysticism, incorporates much of what Ibn ‘Arabī and other philosopher-mystics had brought forth to date. For Mullā Ṣadrā, creation represents four journeys: the Fall, in which unity becomes multiplicity is the first, followed by one’s earthly journey wherein the pain of separation causes an existential yearning towards one’s original abode. According to Mullā Ṣadrā, man’s spiritual ascendance through the path of Sufism and gnosticism constitutes the third part of this journey until unity once again is accomplished. Finally there is the sojourn in the Divine realm, from Truth (ḥaqq) to Truth, a station only few of the spiritual elites may ever experience.