One of Rudolf Steiner's deepest prophetic hints was from a series of lectures in late 1917 which were collected and published in 2004 under the title Secret Brotherhoods and the Mystery of the Human Double.
(All the lectures are also available free on the Rudolf Steiner Archive as GA 178, although these translations are less comprehensible than the 2004 collection.)
I have been re-reading these remarkable works - as always sifting and reinterpreting Steiner's valid 'raw insights' from the (wrong) metaphysical schema and his frequent errors of overelaboration.
Steiner's prediction was that through the twentieth century and into the next, the demonic powers, assisted by their human servants (i.e. the 'secret brotherhoods' of the book title - nowadays broadly corresponding to the highest human levels of component institutions of the global totalitarian System) would have the primary strategy of convincing the masses that this is a wholly material world.
This is the ideology we may call leftism; but which is in essence identical with philosophical materialism/ positivism/ reductionism/ scientism.
Indeed, so successful has this strategy been, and so dominant and habitual its world-view, that we do not have a generally-accepted name for it! Why name what (nearly-) everybody believes?
The reason behind this materialism project is demonic, in the sense that it is the most effective way of achieving mass damnation.
In the past, it was necessary to induce Men to reject Christ and choose Hell in an explicit kind of way; but with global materialism Christ, God, creation, and the whole spiritual world are simply regarded as not-real, nonsense; a childish and foolish delusion.
The question of Jesus Christ has not been refuted by materialism, it has instead been rendered incomprehensible, meaningless, absurd! Which is far more effective.
But the plan of materialism needed to account for Man's perennial seeking for 'spiritual' meaning; for something beyond the mundane - and Steiner perceived that therefore there would need to be ways of rendering and reducing 'the spiritual' to the material.
So that people who regarded themselves as spiritual would actually conceptualize 'spiritual' in a materialist way - without realizing the fact!
And this is precisely what has happened with the New Age tendency in spirituality; which itself evolved and expanded from roots in 'Eastern' or 'Perennialist' Beat Generation in the 1950s, then 1960s Hippy spiritualties.
What happens in such 'spiritualities' is that the spiritual is very rapidly 'operationalized' as something material.
Most obviously there tends to be a focus on this world rather than life beyond death; thi world is seen as the most urgent, the most important, the most real - eventually the only really-real. Therefore, the New Age assimilated to mainstream Leftist political ideologies and projects...
Perhaps the commonest example is when spirituality or consciousness is interpreted as an abstraction therefore not as personal - and using terms from physics; as when New Agers talk - and think! - about spirit in terms of energy, light, vibrations and frequencies.
Another spiritual reduction is when there is a focus upon Healing - and the bulk of New Age spirituality gravitates towards some model of Healing or Therapy - which is both this-worldly, and rooted in feelings, which are substantially material phenomena since they depend on the body and brain, and can be (to some extent) manipulated and controlled.
Thus we arrive at the typical New Age spirituality - rooted in this world, and in feelings; and spiritual practices (such as meditation) become a type of psychotherapy.
Ironically, Anthroposophy has itself taken exactly this path into materialism; and (in its institutional manifestations) has consequently become assimilated into mainstream materialistic leftism. This tendency towards abstraction (including physics metaphors) is seem in Steiner's metaphysics, and his explanation of the nature of Christ.
And the energies of 'Steinerism' became focused on the institution (Anthroposophical Society) rather the individuals; and on the 'applied' materialistic and this-worldly aspects in medicine, education, agriculture etc.
Furthermore (and Steiner himself had encouraged this) the legacy of Steiner became materialistic - with 'expertise' being understood in terms of comprehensive and accurate scholarship of 'what Steiner said' on this, that and the other - regarded as de facto infallible.
Therefore, Steiner's greatest 'disciples' - who are all more or less 'heretical' in terms of the materialist orthodox interpretations rooted in 'what Steiner said' - have been largely ignored, rejected or unnoticed - for example Valentine Tomberg (expelled), Owen Barfield (marginalized), or Joseph Beuys (unnoticed).
Looking back over the past century we can easily see that Steiner was profoundly correct about the way in which materialism has triumphed - explicitly in the realm of public discourse; and implicitly in a great deal of the 'spirituality' of today; which is characterized by abstraction, usage of 'scientistic' vocabulary and concepts, and a focus on 'therapy and 'making this world a better place'.
What is needed is almost the opposite - and Steiner also said this in these lectures; which is to regard the universe as a creation populated with personal Beings - not abstractions; and therefore true spirituality as consisting in a personal relationship with the many spiritual-Beings - such as God, Jesus Christ, angels, the 'so-called dead', and indeed aspects of other Mortal Men.
And, on the other side - the side of evil; the capacity to recognize that evil is also personal not abstract; therefore purposive, not accidental.
From this comes our only genuine defense against the dark arts of evil which is recognition, understanding, and rejection - rejection by means of affiliation with God, which (as of 2022) must come through commitment to following Jesus Christ.
Note: the term 'defense against the dark arts' is a reference to the Harry Potter series of novels; which I am currently re-reading with pleasure and profit.