He tried to walk back some of his greatest insights in the second edition of his most famous works; Schopenhauer advised his readers that they would be wasting their time unless they used both editions together.  
He tried to walk back some of his greatest insights in the second edition of his most famous works; Schopenhauer advised his readers that they would be wasting their time unless they used both editions together.  He illustrated one of his concepts by picturing a man wondering whether to reveal the location of a potential murder victim, and that idea is based off of deontological elements, not consequentialist, which he called categorical imperative.  For ten points, name this German philosopher, author of Prolegomena to any Future Metaphysics and Critique of Pure Reason.
He tried to walk back some of his greatest insights in the second edition of his most famous works; Schopenhauer advised his readers that they would be wasting their time unless they used both editions together.  
Immanuel Kant