Steiner’s Gedankenplan: the level of pure concepts where the knowing subject stands, a fixed boundary that thinking alone can reach but never cross.
The Plane of Thought in Anthroposophy is the level of consciousness on which the knowing subject stands once it has worked sense perception up into concepts, named by Rudolf Steiner in German the Gedankenplan and rendered in English translation as the thought plan or the plan of thought. Steiner set it out in the lecture of 26 August 1910 in Munich, published in Paths and Goals of the Spiritual Human Being (GA 125), where he treats Hegel’s logic as the peak of philosophical discipline ever reached on it. On this plane, thought weaves and produces out of itself, carrying through the dialectic of pure thinking, while the human I serves as the stage on which that weaving happens. Steiner’s decisive claim is that the plane is fixed: the subject can never spin substantial world content out of its own concepts, so the boundary cannot be crossed from below. Passage further asks for fertilisation from the supersensible side.
The Plane of Thought is where Western philosophy stops, according to Steiner, and it stops there for a reason he considered exact rather than regrettable. Concepts can survey everything the human spirit has already produced. They cannot deliver one new fact about the world. Hegel built the most disciplined instrument ever made for working on this plane, and Steiner says that instrument, by itself, cannot become a doorway.
In Steiner’s Own Words
If we wanted to draw a picture of the matter, we could say: if we characterize the thought plan with the subject of knowledge on this thought plan, then everything that can be gained through the senses in terms of external, sensory material flows from the side of sensory perception. Within the thought plan, we sense the Hegelian self-weaving, that which is called the dialectic of pure thinking. But then, if we take only this path, we have to stop. We have to wait until we are able to let that which we can receive on the path characterized by my writing “How to Know Higher Worlds” flow into us from the other side.
What it Means Today
Eighty-four years after Munich, the same boundary reappeared in analytic philosophy under a different name. John McDowell delivered the 1991 John Locke Lectures at Oxford and published them as Mind and World (Harvard University Press, 1994), and the book’s governing anxiety is Steiner’s exactly: if thinking is answerable only to more thinking, it becomes what McDowell calls a frictionless spinning in a void. Coherence without contact. McDowell’s whole effort is to show how conceptual spontaneity can stay answerable to something it did not itself produce, and he was willing to have the book described as a prolegomenon to reading Hegel’s Phenomenology of Spirit, which puts him on the same ground Steiner was standing on. Their solutions diverge sharply. McDowell moves the boundary by arguing that perception is already conceptual, so the world reaches thought without any need to leave the plane. Steiner leaves the boundary where it is and says the plane must be fertilised from the other side, by the exercises of How to Know Higher Worlds. Thalira synthesis: read together, the two positions show that the Plane of Thought is not a philosophical error to be dissolved but a real edge, and the choice a thinker makes there, widen perception or open the plane, decides whether epistemology ends in a description of experience or in a path of schooling.
Where to Read More
- Paths and Goals of the Spiritual Human Being, GA 125
- How to Know Higher Worlds, GA 10, the fertilising exercises Steiner points to
- Find How to Know Higher Worlds at SteinerBooks
- Mercury in Astrology: The Planet of Mind, Communication & Thought
- The Astral Plane: What Esoteric Traditions Say About This Realm
- The Seven Planes of Existence in Theosophical Cosmology