Fakhr al-Din al-Razi

Fakhr al-Din Muhammad ibn Umar al-Razi (544–606 AH / 1149–1210 CE) was one of the most brilliant theological and philosophical minds in the history of Islam, a Persian scholar whose encyclopedic intellect produced major works in Quranic exegesis, theology, philosophy, logic, medicine, and astronomy. He was born in Rayy (near modern Tehran) and studied under the leading scholars of his era.

His magnum opus is Mafatih al-Ghayb (Keys of the Unseen), also known as al-Tafsir al-Kabir — the Great Commentary on the Quran — a work of staggering scope that fills thirty-two volumes and engages every ayah with theology, philosophy, science, linguistic analysis, and jurisprudence. It remains the most philosophically sophisticated tafsir in the classical tradition and is unmatched in its integration of rational and revealed sciences.

He was a committed Asharite theologian who engaged and refuted the Mutazilite, Falsafa (Peripatetic philosophy), and Ismaili positions with extraordinary rigor. He also engaged with Ibn Rushd (Averroes) and the Aristotelian tradition. His philosophical refutations of the arguments for God's existence from traditional Aristotelian cosmology and his alternative theological arguments shaped the post-classical Islamic intellectual tradition.

His relationship with Hanbali scholars, particularly with Ahmad ibn Hanbal's tradition, was one of tension — he was accused of anthropomorphism by some and excessive rationalism by others, with critics from both sides. He reportedly expressed regret near the end of his life about excessive philosophical engagement and said he wished he had followed the simple path of the common people of faith. He died in Herat in 606 AH.