In a lecture on October 27th, 1917 titled The Fallen Spirits' Influence in the World, Steiner stated "today, bodies are vaccinated against one thing and another; in future, children will be vaccinated with a substance which it will certainly be possible to produce, and this will make them immune, so that they do not develop foolish inclinations connected with spiritual life — ‘foolish’ here, of course, in the eyes of materialists."
"People are now vaccinated against consumption, and in the same way they will be vaccinated against any inclination towards spirituality. This is merely to give you a particularly striking example of many things which will come in the near and more distant future in this field — the aim being to bring confusion into the impulses which want to stream down to earth after the victory of the spirits of light."
In The Fall of the Spirits of Darkness, Steiner elaborates "The time will come — and it may not be far off — when quite different tendencies will come up at a congress like the one held in 1912 and people will say: It is pathological for people to even think in terms of spirit and soul. 'Sound' people will speak of nothing but the body. It will be considered a sign of illness for anyone to arrive at the idea of any such thing as a spirit or a soul. People who think like that will be considered to be sick and — you can be quite sure of it — a medicine will be found for this. At Constantinople the spirit was made non-existent. The soul will be made non-existent with the aid of a drug. Taking a 'sound point of view', people will invent a vaccine to influence the organism as early as possible, preferably as soon as it is born, so that this human body never even gets the idea that there is a soul and a spirit. The two philosophies of life will be in complete opposition. One movement will need to reflect how concepts and ideas may be developed to meet the reality of soul and spirit. The others, the heirs of modern materialism, will look for the vaccine to make the body 'healthy', that is, makes its constitution such that this body no longer talks of such rubbish as soul and spirit, but takes a 'sound' view of the forces which live in engines and in chemistry and let planets and suns arise from nebulae in the cosmos. Materialistic physicians will be asked to drive the souls out of humanity."
In another lecture Secret Brotherhoods and the Mystery of the Human Double he stated "a longing will arise(and become)general opinion:Whatever is spiritual, whatever is of the spirit, is nonsense, is madness! Endeavours to achieve this will be made by bringing out remedies to be administered by inoculation just as inoculations have been developed as a protection against diseases, only these inoculations will influence the human body in a way that will make it refuse to give a home to the spiritual inclinations of the soul. People will be inoculated against the inclination to entertain spiritual ideas. Endeavours in this direction will be made; inoculations will be tested that already in childhood will make people lose any urge for spiritual life."
"Suppose such a vaccine existed today which inoculated children at a young age to keep them from having a soul — what signs of this might we find? There would seem to be some epidemic of children being born who do not maturate like children, they would be unable to store feelings of their early childhood, they would have trouble acclimating themselves to other human beings, they will seem extremely intelligent with sharp calculating skills, almost machine-like precision of drawing and copying skills. Does this not sound familiar to the recent concerns of the sudden rise in the incidence of autism and its possible connection to certain vaccination processes? Have the anti-soul vaccinations already begun?"