In this article, the author presents the interpretation of Juan Cruz Cruz, according to whom the philosophy of subjectivity of the later Fichte succeeded in overcoming the errors of the subjective idealism of his youthful period, and which was the only part of Fichte’s philosophy that Hegel knew. For this reason, following Pareyson, Dr. Cruz claims that today we are better prepared to understand the strictly logological character of Fichte’s doctrine of science, understood as a science of science, which at the same time reflects on the ultimate indemonstrable principles of any reflective process of rational self-justification.