The thought of making freedom, once and for all, the alpha and omega of philosophy has set the human spirit free and given science in all its branches a more powerful impulse than any previous revolution. Friedrich Wilhelm Joseph Schelling wrote this in 1809 in his Philosophical Investigations into the Essence of Human Freedom. The sentence marks not only Schelling’s own position but the gravitational centre of an entire epoch: German Idealism.
Between 1780 and 1830, a philosophical movement arose in Germany whose density and radicality have few parallels. Kant, Fichte, Schelling, and Hegel — four thinkers who knew each other, responded to each other, and within a few decades rebuilt the foundations of modern thought. Their shared starting point: the question of what spirit is and what it can accomplish. Their shared fundamental decision: the human being is not a passive mirror of an external world, but an active, self-determining being.
Kant’s Provocation and What Followed
In the Critique of Pure Reason (1781), Immanuel Kant posed the question of how knowledge is possible at all. His answer: not through mere copying of the external world, but through the ordering activity of the understanding. Space, time, and the categories are forms that the subject itself brings to experience. Knowledge arises where intuition and concept work together.
This was a philosophical earthquake. For if the subject contributes its own forms of knowledge, the boundary between world and consciousness is no longer a simple line. The question Kant left open — the question that sets German Idealism in motion: What lies behind that boundary? What is the thing-in-itself that, according to Kant, we can never know directly? Is the I that knows itself merely a product, or is it an origin?
Fichte’s Deed-Act: The I Posits Itself
Johann Gottlieb Fichte (1762—1814) gave the most radical answer. The I is not an object lying around somewhere waiting to be found; it is an activity: the Tathandlung, the deed-act. The I posits itself; it brings itself into being through its own activity. In the Foundation of the Entire Science of Knowledge (1794), Fichte developed a system in which all knowledge is traced back to this self-positing.
Nature, for Fichte, becomes the Not-I: that which stands opposed to the I and must be overcome. Nature is resistance, raw material for moral action. This one-sidedness has consequences. Where nature appears only as an obstacle to the I, it loses its own dignity — and the freedom Fichte thinks so radically finds no place where it can come to rest. Fichte himself wrote in the Addresses to the German Nation (1808) that the distinguishing mark lies in whether one believes in something absolutely first in the human being — in freedom and infinite perfectibility — or in dead nature. It is consistently thought, but it is one-sided: whoever only wants to overcome nature can never truly perceive it.
Schelling: Nature as Living Spirit
This is where Schelling’s counter-movement begins. Friedrich Wilhelm Joseph Schelling (1775—1854) takes up Fichte’s idea of freedom but turns it in a different direction. In the Ideas for a Philosophy of Nature (1797), he shows that nature is not the Other of spirit, but spirit in the state of its becoming. Idealism and realism are not opposites but two sides of the same coin. Schelling calls his position Realidealismus.
The implications reach far. If nature itself is pervaded by spirit, then philosophy cannot stop at the analysis of consciousness. It must take the cosmos as a whole into view: as a living organism, not a dead mechanism. Schelling’s natural philosophy thus becomes the consistent extension of the idealist programme: it carries the idea of freedom out of pure consciousness and back into reality.
In the Freedom Essay (1809), Schelling condenses this approach. Freedom, he argues, is not merely a property of the human being but the positive concept of the thing-in-itself. Whoever has tasted freedom wants to spread it across the whole of reality. Mere idealism — Fichte’s path — remains formal. It proves that activity and freedom are the truly real, but it does not show that, conversely, everything real has freedom as its ground.
Hegel’s System and Its Limit
Georg Wilhelm Friedrich Hegel (1770—1831) constructed the most comprehensive systematic attempt of German Idealism. In Hegel, spirit unfolds through a dialectical process: thesis, antithesis, synthesis. Nature is spirit externalised; history is the return of spirit to itself. The Phenomenology of Spirit (1807) traces the path of consciousness from sensory experience to absolute knowledge.
The strength of this approach lies in its power of integration. Hegel absorbs everything: art, religion, science, history. The limit appears where the dialectical process becomes a closed system. When spirit returns to itself at the end and everything is sublated into the Idea, then precisely what Schelling wanted to avoid threatens to occur: living nature is reduced to a mere way station.
Schelling recognised this problem early. In the Munich lectures on the History of Modern Philosophy (1827), he criticised Hegel’s dialectic as a system that converts the living process into logical necessity. Where Hegel says synthesis, he means sublation — the particular dissolves into the universal. Schelling’s objection: genuine development is not the unfolding of a predetermined logic but the open expression of living freedom. The next moment must have genuine room to manoeuvre; otherwise the freedom that German Idealism claims to think is just another word for necessity.
Why Schelling Is the Decisive Thinker of This Tradition
In terms of reception history, Hegel won. Academic philosophy, Marxism, modern dialectics — all of these run through Hegel. Schelling’s natural philosophy was long dismissed as romantic speculation, a superseded preliminary stage.
Jochen Kirchhoff showed in Spaces, Dimensions, World Models (1999) and What the Earth Wants (2009) why this judgement is wrong. Schelling’s fundamental decision — that nature is alive and the cosmos is pervaded by spirit — is not romantic reverie but a philosophical position that can be measured against reality. To declare nature a mere mechanism is not a scientific finding but a metaphysical prejudgement — one that Schelling identified as bad metaphysics.
For philosophical practice, this is where the decisive difference lies. Fichte’s absolute I leads to moral demands; Hegel’s absolute spirit leads to conceptual sublation. Schelling’s natural philosophy leads to a practice of perception: the capacity to experience the cosmos as a living whole. The space organ, spoken of in philosophical accompaniment, stands in this lineage. It is the organ for experiencing what Schelling thought philosophically.
What Remains
German Idealism is not a closed historical episode. Its fundamental question — whether spirit is a property of the living or an illusion of matter — stands more sharply today than ever. In an age when artificial intelligence simulates thought and neuroscience reduces consciousness to neural processes, the idealist position gains new urgency: spirit cannot be derived from matter, because matter itself is accessible only through spirit.
Schelling’s Realidealismus remains the approach that takes this insight seriously without sacrificing nature to spirit. Whoever asks about the philosophical foundations of logic, of judgement, and of natural philosophy cannot avoid German Idealism. Whoever wants to understand why Jochen Kirchhoff thinks the cosmos as a living organism must go back to Schelling. Gwendolin’s seminars work within this lineage — bringing Schelling’s natural philosophy into lived encounter.