Tusi's Three Philosophical Questions

This is a translation of three philosophical questions raised by Tusi (1201–1274) in his letter to Khusrawshahi (1184-1254). These critical questions are related to three main fields of philosophy: Philosophy of Nature, Philosophical Psychology (or Philosophy of the Soul) and Philosophical Theology which is traditionally subsumed as one of the proper subtopics of Metaphysics. Although Tusi did not receive any recorded response from Khusrawshahi, his short letter attracted considerable scholarly attention and received some remarkable responses, in later Islamic philosophy and thus provided an exemplar of the traditional technique of debating by way of “question-answer” correspondence.