“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 toward 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, or course, in the eyes of materialists. . . ."

http://www.renegadetribune.com/in-1917-rudolf-steiner-foresaw-a-vaccine-that-would-drive-all-inclination-toward-spirituality-out-of-peoples-souls/

https://wn.rsarchive.org/Lectures/GA177/English/RSP1993/FalDar_index.html