Sadr al-Din Muhammad b. Ibrahim b. Yahya Qawami Shirazi;
(ca. 1571–1636) is arguably the most significant Islamic philosopher after Avicenna. Best known as Mulla Sadra, he was later given the title of Sadr al-Muta’allihin (Master of the theosists) for his approach to philosophy that combined an interest in theology and drew upon insights from mystical intuition. He considered philosophy to be a set of spiritual exercises and a process of theosis, a pursuit of wisdom whose goal was to acquire wisdom and become a sage, and hence become godlike. He championed a radical philosophical method that attempted to transcend the simple dichotomy between a discursive, ratiocinative mode of reasoning and knowing, and a more intuitive, poetic and non-propositional mode of knowledge. He became famous as the thinker who revolutionized the doctrine of existence in Islamic metaphysics.