38« KANT. through teleological connection, they make an extension of the use of the understanding possible within the realm of experience,* though not beyond it. The systematic devel- opment of the Kantian teleology, which is here indicated in general outlines only, is found in the second part of the Critique of Judgment ; while the practical philosophy, which furnishes the only possible proof, the moral proof, for the reality of the Ideas, erects on the site left free by the removal of the airy summer-houses of dogmatic metaphysics the solid mansion of critical metaphysics, that is, the meta- physics of duties and of hopes. " I was obliged to destroy knowledge in order to make room for faith." The transition from the impossible theoretical or speculative knowledge of things in themselves to the possible " practical knowledge " of them (the belief that there is a God and a future world) is given in the Doctrine of Method, which is divided into four parts (the Discipline, the Canon, the Architectonic, and the History of Pure Reason), in its second chapter. There, in the ideal of the Summnm Bonum, the proof is brought forward for the validity of the Ideas God, freedom, and immortality, as postulates inseparable from moral obliga- tion ; and by a cautious investigation of the three stages of assent (opinion, knowledge, and belief) both doctrinal and moral belief are assigned their places in the system of the kinds of knowle dge. WelitSyTTow sum up the results of the three parts of Kant's theoretical philosophy. The pure intuitions, the categories, and the Ideas are functions of the spirit, and afford non-empirical {erfahriingsfreie') knowledge concern- ing the objects of possible experience (and concerning the possibility of knowledge). The first make universal and necessary knowledge possible in relation to the forms under which objects can be given to us ; the second make a sim- ilarly apodictic knowledge possible in relation to the forms under which phenomena must be thought ; the third make possible a judgment of phenomena differing from this
- The principle to regard all order in the world (e. g. , the shape of the
earth, mountains, and seas, the members of animal bodies) as if it proceeded from the design of a supreme reason leads the investigator on to various dis- coveries.
