The age of materialism is striving, through the work of certain circles, to paralyse, to eliminate all spiritual development in mankind, to bring human beings to a point where simply by temperament and character they reject everything that is spiritual and regard it as folly.
This trend — and it is already perceptible in some individuals today — will intensify. People will actually long for the time when the Spiritual is universally deemed to be insanity, craziness! Attempts will be made to achieve this end by inoculations; just as viruses have been discovered as means of protection against illnesses, so certain inoculations will be used to influence the human body in such a way that it provides no place for the spiritual proclivities of the soul. Human beings will be immunised against any predisposition for spiritual ideas … such, at least, will be the endeavour. They will try by inoculation to bring it about that even in childhood, human beings lose the urge towards the spiritual life.
Source: Rudolf Steiner – GA 178 – Behind the scenes: Lecture 1 – Zurich, November 6, 1917