The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes.

Avicenna (980 CE-1037 CE), Ibn Sina was a preeminent philosopher and physician of the Muslim world, flourishing during the Islamic Golden Age, serving in the courts of various Iranian rulers. He is often described as the father of early modern medicine. His philosophy was of the Muslim Peripatetic school derived from Aristotelianism