Abstract

One of the views which Ibn Sina has seriously challenged is Plato's theory of ideas. No doubt, when plato propounded such a theory he was firmly convinced that thereby he can explain the genesis of the world of sensilbe objects.Ibn Sina, is one of the philosophers who has had a negative assessment of Platonic theory of ideas and explicity has attributed it to the immature period of Greek thought while at the same time he does not conceal his praising for the other contemporary and great disciple of Plato that is Aristotle. He explicitly regards belief in ideas due to ignorance. In his view such a theory is not based on strong demonstrative logic.Some parts of Ibn Sina's important works have been devoted to the review and criticisme of this theory, among them we can point to the seventh article in the theology of Shifa.In this article the writer intends that with a view to the general structure of that theory in Plato's thought and reformuted form in Ibn Sina's philosophy to show that why unlike other Muslim philosophers such as Sheiykh Ishraq and Mulla Sadra who have embraced that theory, Ibn Sina has maintained that this theory is inadequate in explaining the order of word's creation.For this reason by a review of written ideas of Plato and Ibn Sina's pereception of that theory it has been tried to show that Ibn Sina's philosophical critique bas been so much justified.