Influenced by Avicennism and Neoplatonism, the Persian or Kurdish, philosopher Shahab al-Din Suhrawardi (1155–1191), who left over 50 writings in Persian and Arabic, founded the school of Illumination. He developed a version of illuminationism (Persian حكمت اشراق hikmat-i ishrāq, Arabic: حكمة الإشراق ḥikmat al-ishrāq). The Persian and Islamic school draws on ancient Iranian philosophical disciplines, Avicennism (Ibn Sina’s early Islamic philosophy), Neoplatonic thought (modified by Ibn Sina), and the original ideas of Suhrawardi.
In his Philosophy of Illumination, Suhrawardi argued that light operates at all levels and hierarchies of reality (PI, 97.7–98.11). Light produces immaterial and substantial lights, including immaterial intellects (angels), human and animal souls, and even 'dusky substances', such as bodies.
Suhrawardi's metaphysics is based on two principles. The first is a form of the principle of sufficient reason. The second principle is Aristotle's principle that an actual infinity is impossible.
None of Suhrawardi's works were translated into Latin, and so he remained unknown in the Latin West, although his work continued to be studied in the Islamic East. According to Hosein Nasr, Suhrawardi was unknown to the west until he was translated to western languages by contemporary thinkers such as Henry Corbin, and he remains largely unknown even in countries within the Islamic world. Suhrawardi tried to present a new perspective on questions like those of existence. He not only caused peripatetic philosophers to confront such new questions but also gave new life to the body of philosophy after Avicenna. According to John Walbridge, Suhrawardi's critiques of Peripatetic philosophy could be counted as an important turning point for his successors. Although Suhravardi was first a pioneer of Peripatetic philosophy, he later became a Platonist following a mystical experience. He is also counted as one who revived the ancient wisdom in Persia by his philosophy of illumination. His followers, such as Shahrzouri and Qutb al-Din al-Shirazi tried to continue the way of their teacher. Suhrewardi makes a distinction between two approaches in the philosophy of illumination: one approach is discursive and another is intuitive.
- John Walbridge, “The leaven of the ancients: Suhrawardī and the heritage of the Greeks”, State University of New York Press, 1999. Excerpt: “Suhrawardi, a 12th-century Persian philosopher, was a key figure in the transition of Islamic thought from the neo-Aristotelianism of Avicenna to the mystically oriented philosophy of later centuries.”
- Seyyed Hossein Nasr, “The need for a sacred science”, SUNY Press, 1993. Pg 158: “Persian philosopher Suhrawardi refers in fact to this land as na-kuja abad, which in Persian means literally utopia.”
- Matthew Kapstein, University of Chicago Press, 2004, "The presence of light: divine radiance and religious experience", University of Chicago Press, 2004. pg 285:"..the light of lights in the system of the Persian philosopher Suhrawardi"
- Hossein Ziai. Illuminationsim or Illuminationist philosophy, first introduced in the 12th century as a complete, reconstructed system distinct both from the Peripatetic philosophy of Avicenna and from theological philosophy. in: Encyclopaedia Iranica. Volumes XII & XIII. 2004.
- R. Izady, Mehrdad (1991). The Kurds: a concise handbook.
- Kamāl, Muḥammad (2006). Mulla Sadra's transcendent philosophy.
- C. E. Butterworth, M. Mahdi, The Political Aspects of Islamic Philosophy, Harvard CMES Publishers, 406 pp., 1992, ISBN 0-932885-07-1 (see p.336)
- M. Kamal, Mulla Sadra's Transcendent Philosophy, p.12, Ashgate Publishing Inc., 136 pp., 2006, ISBN 0-7546-5271-8 (see p.12)
- Henry Corbin. The Voyage and the Messenger. Iran and Philosophy. Containing previous unpublished articles and lectures from 1948 to 1976. North Atlantic Books. Berkeley, California. 1998. ISBN 1-55643-269-0.
- Henry Corbin. The Man of Light in Iranian Sufism. Omega Publications, New York. 1994. ISBN 0-930872-48-7.
- Philosophy of Illumination 77.1–78.9
- Philosophy of Illumination 87.1–89.8
- Marcotte, Roxanne, "Suhrawardi", The Stanford Encyclopedia of Philosophy (Summer 2012 Edition), Edward N. Zalta (ed.), URL = <http://plato.stanford.edu/archives/sum2012/entries/suhrawardi/>.
- Hosein Nasr & 1997 three muslin sages, p. 55
- Nasr & 2006 Islamic philosophy from its origin to the present, p. 86
- Walbridge in Adamson & and Taylor 2005, pp. 201–223
- Suhrawardi and the School of Illumination by Mehdi Amin Razavi
- Islamic Intellectual Tradition in Persia by Seyyed Hossein Nasr