Steiner taught that a trace of potassium cyanide forms and instantly dissolves in the limbs with every movement, and that this rhythm of poisoning and detoxification carries the will.
Potassium Cyanide and the Will in Anthroposophy is Rudolf Steiner's teaching that human volition rests on a chemical rhythm: with every movement of a limb, even of a single finger, carbon and nitrogen unite toward prussic acid, potassium cyanide begins to form, and the organism immediately dissolves it again. Steiner gave this account in the lecture of 24 October 1923 at Dornach, published in How Spirit Works in Nature (GA 351), telling the Goetheanum workmen that this ceaseless alternation of poisoning and detoxification is the secret of human life. The process belongs to the will pole of the human being, the limbs and metabolic system, and stands opposite the carbonic acid that rises to the head and serves thinking. Cosmically, Steiner tied the cyanide process to the sun and to comets. Contemporary pharmacology, which now studies cyanide as an endogenous signaling molecule, gives the teaching an unexpected modern echo.
Potassium Cyanide and the Will names the physiological half of Steiner's cyanide teaching. Speaking to the workmen at the Goetheanum, he described a body that flirts with its own most efficient poison at every step: prussic acid wants to form wherever carbon and nitrogen meet in the limbs, and the act of preventing and dissolving it is what we experience as the power to move.
In Steiner's Own Words
So let's start with walking, moving our hands, moving our arms – that's actually where this volition begins: we always have to form a compound of carbon and nitrogen and then break it down again. But this cyanide or prussic acid must constantly, so to speak, enter our limbs. It then combines with potassium in the limbs. Potassium cyanide is formed, but this is also immediately broken down again. In order for us to be able to live at all, there must be a constant process of poisoning and detoxification within us. That is the secret of human life: carbonic acid on the one hand, potassium chloride, which is connected to potassium, on the other. With every movement, with every finger, a little cyanic acid is formed, and the thing is then that we dissolve the thing again immediately by moving our fingers.
What it Means Today
For most of the twentieth century, Steiner's claim sounded like pure image: the body as a vessel that continually generates and neutralizes its deadliest poison. Pharmacology has since arrived somewhere unexpectedly close. Researchers who study gasotransmitters, the small gaseous molecules such as nitric oxide and hydrogen sulfide that cells use as signals, have turned their attention to cyanide itself. In 2022 Karim Zuhra and Csaba Szabo of the University of Fribourg published a review in The FEBS Journal, titled "The two faces of cyanide: an environmental toxin and a potential novel mammalian gasotransmitter," gathering evidence that mammalian cells produce hydrogen cyanide endogenously in trace amounts, that dedicated enzymes break it down on site, and that at these vanishingly low concentrations it may stimulate rather than block cellular energy production. The proposal remains under debate, and nothing in it invites any experiment on oneself; cyanide is lethal at anything beyond trace levels. What matters for readers of Steiner is the shape of the finding: a poison made continuously inside the body, held below harm by equally continuous breakdown, and possibly doing real physiological work through that very tension.
Thalira synthesis: what Szabo's laboratory measures as a resident toxin held at the threshold of signal, Steiner described in 1923 as the ground of the will, a power that exists only because the organism keeps winning, moment by moment, a contest it can never finally close. The two vocabularies do not confirm one another, but they circle the same fact of life.
Where to Read More