The Doctrine of Science 1813 is the last organic exposition of the philosophical system of Fichte. This work incorporates in itself the coherence of the development of the philosopher’s thought, as well as its undoubted creativity in conceptual terms. It is not by chance that in this work Fichte presents an unpublished tool, a constellation of notions that implement the complex and constitutively articulated character of the “doctrine of the image” in which its late transcendental philosophy is found. In fact, in the concept of image, both the productive, genetic, and thoughtful instance, as well as its recursive and reflective instance, are mutually implicated. In other words, the transcendental gesture is inaugurated starting from the putting into reflective form of the imagination. Two movements – reflection and imagination – that testify to a thought that, inaugurated by the deconstruction of dogmatism, tune into the absolute and, intercepting its dynamism, exposes the relationships that link the principle to subjectivity. In such an exposition, however, the doctrine of science is transfigured itself, passing from being to know to being a form of life illuminated. The transcendental, thus, is intertwined with the life from which it has taken the moves: it becomes wisdom in short.