At the beginning...

At the beginning, because of the support of the governmental authorities for these sciences, their opposition did not have much effect. But conditions soon changed through strict orders many philosophical works were destroyed. The Epistles of the Brethren of Purity, which is the work of a group of unknown authors, is a reminder of those days and attests to the unfavorable conditions of that epoch.

After this period of difficulty, philosophy was revived at the beginning of the 4th/10th century by the famous philosopher Abu Nasr al-Farabi. In the 5th/11th century, as a result of the works of the celebrated philosopher Ibn Sina (Avicenna), Peripatetic philosophy reached its full development. In the 6th/12th century Shaykh al-Ishraq Shihab al-Din Suhrawardi systematized the philosophy of illumination (ishraq) and because of this was executed by the order of Salah al-Din Ayyubi.

Thereafter, philosophy ceased to exist among the Muslim majority in the Sunni world. There was no further outstanding philosopher in that part of the Muslim world except in Andalusia at the edge of the Islamic world where at the end of the 6th/12th century Ibn Rushd (Averroes) sought to revive the study of philosophy.

Shi'ite Contributions to Philosophy and the Intellectual Sciences In the same way that from the beginning Shi'ism played an effective role in the formation of Islamic philosophical thought, it was also a principal factor in the further development and propagation of philosophy and the Islamic sciences. Although after Ibn Rushd philosophy disappeared in the Sunni world, it continued to live in Shi'ism.

After Ibn Rushd there appeared such celebrated philosophers as Khwajah Nasir al-Din Tusi, Mir Damad, and Sadr al-Din Shirazi, who studied, developed and expounded philosophical thought one after another. In the same manner, in the other intellectual sciences, there appeared many outstanding figures such as Nasir al-Din Tusi (who was both philosopher and mathematician) and Birjandi, who was also an outstanding mathematician.

All the sciences, particularly metaphysics or theosophy (falsafah-i ilahi or hikmat-i ilahi), made major advances thanks to the indefatigable endeavor of Shi'ite scholars. This fact can be seen if one compares the works of Nasir al-Din Tusi, Shams al-Din Turkah, Mir Damad, and Sadr al-Din Shirazi with the writings of those who came before them.