In Steiner's view, forgetting is the etheric body digesting a released mental picture, a benefactor of life that nourishes health in waking and frees the soul after death.
Forgetting in Anthroposophy is the healthy release of a mental picture from waking consciousness so the etheric body can digest it, set out by Rudolf Steiner in The Being of Man and His Future Evolution (GA 107, lecture of 2 November 1908, Berlin). Memory, for Steiner, depends on the etheric body retaining impressions; forgetting is its necessary counter-process. Once an impression sinks into oblivion, it stops being chained to its outer object and begins to work inwardly on the free part of the etheric body, developing germinal forces that nourish memory, recovery from illness, and inner mobility. Steiner names this the blessing of forgetting, since an etheric body forced to hold everything would grow dried up and rigid. The same law governs life after death: across the River of Forgetfulness the soul loosens its ties to the physical world, passing from Kamaloca into Devachan.
Forgetting, in Rudolf Steiner's spiritual science, is not a defect of the soul but a benefactor of life. The same etheric body that retains a thought must also let it go, and in letting go the released picture turns inward to nourish the human being. Steiner traces this single law from the forgotten worry that restores health to the soul crossing the River of Forgetfulness on its way between death and rebirth.
In Steiner's Own Words
The moment it sinks into oblivion it begins to work. So it can be said that work is continually in progress in and upon the free part of the etheric body. And what is it that does the work? It is the forgotten ideas! That is the great blessing of forgetting! As long as a mental image remains in your memory you connect it with an object. If you observe a rose and carry the mental image of it in your memory, you connect the image of the rose with the outer object. The image is thus chained to the external object and has to send it its inner force. The moment you forget the image, however, you set it free. Then it begins to develop germinal forces which work inwardly on man's etheric body. So our forgotten memories have great significance for us.
What it Means Today
For most of the twentieth century, memory research treated forgetting as failure, a leak in a system whose job was perfect retention. That assumption was directly challenged in June 2017, when Blake Richards and Paul Frankland of the University of Toronto published "The Persistence and Transience of Memory" in the journal Neuron. Their argument, drawn from work at the Hospital for Sick Children, is that the brain runs active forgetting circuits on purpose: the goal of memory is not to store everything but to guide good decisions, and that goal is served by clearing outdated and interfering detail. Forgetting, in their framing, is adaptive housekeeping, not breakdown.
The convergence with GA 107 is striking. Steiner had already insisted, in 1908, that forgetting is salutary rather than defective, and that an etheric body forced to retain everything would grow rigid and ill. Where the neuroscientists locate the mechanism in synaptic turnover, Steiner located it in the digestion of released pictures by the free part of the etheric body. Thalira synthesis: both accounts agree that a being who could not forget would be a being who could not heal, which reframes forgetting as the metabolism of inner life rather than the failure of it. The practical counsel follows directly. Steiner advised against forcing yourself to retain a grievance or a worry, since the thought that is let go turns inward as soothing balm, while the one held fast introduces something hard and lifeless into the etheric body.
Where to Read More