Bernard Bolzano’s work as a scholar and scientist was guided by the idea that all the truths of all fields of knowledge constitute an objective order given independently of our thinking and knowledge. This holds also for the truths of the various areas of philosophy such as logic and epistemology, metaphysics and philosophy of religion, ethics and political philosophy. It is the task of philosophy to discover these truths and their order. The result of this endeavour is the system of philosophy: it unites all the philosophical truths in a strict logical order. This system of philosophy is completely different from all the complacent »philosophical systems« from which Bolzano repeatedly disassociated himself. In his book Edgar Morscher presents a reconstruction of Bernard Bolzano’s system of philosophy in accord with the latest developments of Bolzano research and uses all sources now available through the Bernard-Bolzano-Gesamtausgabe.