He wrote several polemical treatises during his time at the court of the Ilkhan. These were largely directed against Sunni, Ash'arite theology. In them, he was largely concerned with espousing and defending the Shia view of the Imamate and Mutazilite notions of free will (as opposed to Asharite determinism). He was also acquainted with Avicennan and Ishraqi philosophy. He wrote several works of his own, dealing with subjects such as logic, physics, metaphysics and mathematics. In general he is very critical of the opinions held by Islamic philosophers and sets out to rebut them whenever they appear to disagree with mainstream theology. According to the Encyclopaedia of Islam, “his services were so much appreciated by the Shi'is that soon after his death his grave in Mashhad became one of the centres of veneration for those who go on pilgrimage to the tomb of Imam 'Ali-al-Rida”.