al-Sijistani, Abu Sulayman Muhammad (c.932–c.1000)

Al-Sijistani was one of the great figures of Baghdad in the fourth century AH (tenth century ad). He assembled around him a circle of philosophers and litterateurs who met regularly in sessions to discuss topics related to philosophy, religion and language. As a philosopher with a humanistic orientation, his concerns went beyond subjects of strictly philosophical nature. His philosophical ideas displayed Aristotelian and Neoplatonic motifs. He considered philosophy and religion to be totally different in nature and method, so that the two could not be reconciled. God is only prior to the world in essence, rank and nobility, not in time. Al-Sijistani insisted that in no way should one attribute to God the imperfections of created things. According to him, the soul is simple by nature and natural reason is capable of attaining a state of pure knowledge that enables one to distinguish between good and evil. Reason, if taken as a guide, could ensure happiness.