چکیده (انگلیسی): Classified as both idealist and romanticist, Schopenhauer’s philosophical system is basically based on one single thought which deals with his doctrine of the ultimate reality that stands behind all existing entities. This single thought is born out of the dualistic philosophical conviction that there are two aspects of the world – namely, the world as representation or the external aspect of the world (the phenomenal world to use Kant»s terminology), and the world as will or the internal aspect of the world (the noumenal world or the thing-in-itself in Kant»s terminology). Schopenhauer displays this single thought in four successive parts or books in his main work The World as Will and Representation. These four parts completely unfold Schopenhauer’s single thought in respects of epistemology, metaphysics, aesthetics, and ethics. The first part highlights the theme of the world as we perceive through our ordinary consciousness attained through science and common sense. The second part presents the world as such, and sheds light on the evil nature of the ultimate Reality of the world, hence showing Schopenhauer»s metaphysical pessimism. The third and fourth parts provide the ways Schopenhauer suggests for finding salvation and escape from the evil of the world. He maintains that human beings can find salvation in acquiring a high level of consciousness found in both the artistic experience and the ascetical life of the saint. Schopenhauer takes the part displaying the world as representation – mentioned in his doctoral dissertation On The Fourfold Root of the Principle of Sufficient Reason and in Book I of The World as Will and Representation – to be an indispensable introduction to the understanding of his theory of metaphysics. And it is this part which is the subject-matter of the present thesis.