A Critique of Jean-Paul Sartre's Ontology. That essay made a lasting impression on me. And although it may seem irrelevant to try to explain how I came to realize that I am an Existentialist, or at least how I came to pin that label on my sleeve, and although it may seem unfair to remind an author of his first book, there is nevertheless an important connection between that essay and the present contribution to this volume. The connection is this: At the very end of his essay, Natanson says that "Sartre's greatest achievement is to have returned us to the nexus of philosophical problems concerned with the ultimate isomorphism between human subjectivity and human reality. We are returned, then, to the profound core of Kant's Copernican revolution and to the question: Can phenomenological ontology complete or advance beyond the Copernican revolution?"¹" /> Notes from the underground - Frederick Kersten | sdvig press