English: It is claimed that Ibn Sina had written about 450 works, of which 240 had survived.3 Some bibliographers list only 21 major and 24 minor works dealing with philosophy, medicine, astronomy, geometry, theology, philology and art. He wrote several books on philosophy, the most significant was “Kitab al Shifa” (The Book of Healing). It was a philosophical encyclopedia that brought Aristotelian and Platonian philosophical traditions together with Islamic theology in dividing the field of knowledge into theoretical knowledge (physics, metaphysics and mathematics) and practical knowledge (ethics, economics and politics). Another book on philosophy was “Kitab al-Isharat wa al tanbihat” (Book of Directives and Remarks).