The migration of Mulla Sadra who was originally from Shiraz, from Isfahan to Qum led to the recession of rational sciences in the seminaries of Isfahan, but it led to their flourishing in the seminaries of Qum. Through training students and by the means of his writings, he paved the way for the Usuli 45 attitude in the seminaries even though before this period the seminaries trained more Shi’a muhaddiths 46 than scholars of rational sciences. Sadr al-Muta’allehin Muhammad ibn Ibrahim Shirazi (979 - 1050 AH) was one Shi’a philosopher and theologian who lived in this period.
Sheikh mashuhuri na mwenye kuheshimiwa katika Ahli Sunna,anaandika kwa marefu juu ya kuwapo kwa Imam Mahdi a.s. katika kitabu chake Al-Fusul ul-muhimmah kama yafuatavyo: ' Sura ya kumi na mbili: Katika kuzungumzia mwana wa Imam Hasan al-Askary a.s. aitwaye Abul Qasim Muhammad hujjat Khalaf Saleh,naye ambaye ni Imam wa kumi na mbili,na kuelezea historia yake ya kuzaliwa na Uimamu wake na katika dalili zake na hali yake na ghaibat na muda wa kuwapo kwa autawala wake na katika kuelezea nasabu yake,kuniyyat na laqab yake. '