This study deals with the young Luther's critique and appropriation of Aristotle in his scholastic interpretation. The author is concerned with questions of how the young Luther appropriated Aristotle. Which Aristotle did the young Luther mean in his various comments on "Aristotle"? What is their exact content? How does Luther argue in dealing with Aristotle, and what problems evolve from this? What are the various forms this appropriation took? The author analyzes the problems for systematic theology which evolve here in regard to their historical sites.