 Suhrawardī is also credited with having advocated an epistemological theory known as “knowledge by presence” (‘ilm al-ḥuḍurī), in which knowledge is attained directly and experientially when the knower, known, and the epistemic relation become one and the same (Yazdi 1992). Suhrawardī’s works on Sufism, most of which are written in Persian, include The Red Intellect (‘Aql-i surkh), The Chant of Gabriel’s Wing (Āwaz-i par-i Jibrā’īl), Story of the Occidental Exile (Qiṣṣat al-ghurbat al-gharbiyyah), Language of the Termites (Lughat-i murān), Treatise on the State of Childhood (Risālah fi ḥālat al-ṭufuliyyah), A Day Among the Sufis (Ruzī bā jamā‘at-i ṣufiyān), The Sound of the Griffin (Safir-i simurg), Treatise of the Nocturnal Ascent (Risālah fi’l-mi‘rāj), and Treatise of Illumination (Partaw-nāmah) (Aminrazavi 1994).