VI. The Age of Kant and Goethe

Kant could not possibly adopt this conclusion of Hume as his own. For him, the certainty of the knowledge of mathematical natural science was irrevocably established. He would not allow this certainty to be touched but was unable to deny that Hume was justified in saying that we gain all knowledge about real things only by observing them and by forming for ourselves thoughts about their connection that are based on this observation. If a law-ordered connection is inherent in things, then we must also extract this connection out of them, but what we really derive from the things is such that we know no more about it than that it has been so up to the present time. We do not know, however, whether such a connection is really so linked up with the nature of things that it cannot change in any moment. If we form for ourselves today a world conception based on our observations, events can happen tomorrow that compel us to form an entirely different one. If we received all our knowledge from things, there would be no certainty. Mathematics and natural sciences are a proof of this. That the world does not give its knowledge to the human mind was a view Kant was ready to adopt from Hume. That this knowledge does not contain certainty and truth, however, is a conclusion he was not willing to draw. Thus, Kant was confronted with the question that disturbed him deeply: How is it possible that man is in possession of true and certain knowledge and that he is, nevertheless, incapable of knowing anything of the reality of the world in itself?