I have pointed out that while human bodies will develop in such a way that certain spiritualities can find room in them, the materialistic bent, which will spread more and more under the guidance of the spirits of darkness, will work against this and combat it by physical means.
I have told you that the spirits of darkness are going to inspire their human hosts, in whom they will be dwelling, to find a vaccine that will drive all inclination towards spirituality out of people’s souls when they are still very young, and this will happen in a roundabout way through the living body.
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.
Source: Rudolf Steiner – GA 177 – Fall of the spirits of darkness – LECTURE 13: The Fallen Spirits’ Influence in the World – Dornach, 27 October 1917
Translated by Anna R. Meuss