Delusion occupies a pivotal position across the depth-psychology corpus, serving simultaneously as a clinical symptom, a structural feature of disordered reality-contact, a spiritual category, and — most ambitiously — a condition endemic to ordinary human consciousness. Bleuler's foundational psychiatric treatment in *Dementia Praecox* establishes delusion as neither a secondary product of hallucination nor a simple hypertrophy of the ego, but as an expression of the same primary distortion of reality that pervades all schizophrenic symptomatology; it is coordinate with, not caused by, sensory deception. Freud's Introductory Lectures press the question further, demanding that hereditary predisposition alone cannot account for the specific content of delusional jealousy and pointing toward wish-fulfillment as the generative force. McGilchrist relocates the mechanism neurologically, arguing that extravagant delusions are predominantly products of right-hemisphere damage or dysfunction — distorted reality-judgments, as opposed to the distorted perceptions of hallucination. The Philokalia tradition reads delusion as a spiritual-ontological catastrophe rooted in arrogance and self-conceit, producing a cascade from illusory vision through blasphemy to mental derangement. Buddhist and Zen voices — Brazier, Campbell, the Taoist tradition in Wilhelm — extend the category to name ordinary self-identification as the foundational delusion, the root obscuration from which greed, pride, and opinionatedness ramify. Campbell pointedly distinguishes the therapeutic aim of returning the patient to 'the general delusion' from the religious aim of extinguishing delusion altogether. These positions together reveal a productive tension: whether delusion is a pathological exception to normal cognition, or whether normal cognition is itself a structured delusion that clinical and contemplative disciplines must both, in their different registers, dissolve.
In the library
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nearly all delusions, as well – in particular the more extravagant ones – are due to right hemisphere damage or dysfunction. Distinguishing delusions (distorted reality judgments) from hallucinations (distorted perceptions) is to some deg
McGilchrist argues that delusions, defined as distorted reality judgments rather than distorted perceptions, are overwhelmingly attributable to right-hemisphere damage or dysfunction, distinguishing them neurologically from hallucinations.
McGilchrist, Iain, The Matter with Things: Our Brains, Our Delusions, and the Unmaking of the World, 2021thesis
nearly all delusions, as well – in particular the more extravagant ones – are due to right hemisphere damage or dysfunction. Distinguishing delusions (distorted reality judgments) from hallucinations (distorted perceptions) is to some deg
A parallel formulation from the same author consolidating the neurological thesis that delusion is a judgment disorder, not a perceptual one, traceable to right-hemisphere pathology.
McGilchrist, Iain, The Matter With Things: Our Brains, Our Delusions and the Unmaking of the World, 2021thesis
When a delusion cannot be dissipated by the facts of reality, it probably does not spring from reality. Where else then does it spring from?
Freud frames the defining feature of delusion as its imperviousness to reality-testing, and demands an explanation of its specific content and origin that hereditary predisposition alone cannot supply.
Freud, Sigmund, Introductory Lectures on Psycho-Analysis, 1917thesis
disturbances in the thinking process lead to distortions in the conception of reality. These distortions are most clearly expressed in the delusions, but also in deceptions of senses and memory.
Bleuler locates delusion as the primary and most legible expression of a global distortion of reality arising from disordered thinking, coordinate with rather than caused by sensory deceptions.
Bleuler, Eugen, Dementia Praecox or the Group of Schizophrenias, 1911thesis
the aim of the religious teaching is not to cure the individual back again to the general delusion, but to detach him from delusion altogether; and this not by readjusting the desire (eros) and hostility (thanatos)—for that would only originate a new context of delusion
Campbell distinguishes psychoanalytic cure, which restores the patient to collective delusion, from religious liberation, which aims at the extinction of delusion itself at the root rather than its reconfiguration.
Campbell, Joseph, The Hero With a Thousand Faces, 2015thesis
Primordial delusional ideas which enter consciousness already complete without having been precipitated by hallucinations and which the patients cannot trace to their origin, must, of course, be considered results of unconscious thinking processes
Bleuler establishes that primary delusions arise from unconscious processes independent of hallucination, undermining any causal reduction of delusion to sensory deception.
Bleuler, Eugen, Dementia Praecox or the Group of Schizophrenias, 1911thesis
arrogance is followed by delusion, delusion by blasphemy, blasphemy by fear, fear by terror, and terror by a derangement of the natural state of the mind.
The Philokalia presents delusion as a spiritually generated cascade rooted in arrogance and self-conceit, producing a progressive derangement from illusory vision through blasphemy to mental breakdown.
Palmer, G. E. H. and Sherrard, Philip and Ware, Kallistos (trs.), The Philokalia, Volume 4, 1995thesis
When the basic delusion of self becomes expansive, it appears as pride. When it contracts it manifests as doubt.
Brazier, drawing on Buddhist analysis, identifies the foundational delusion as the illusion of self, from which the further afflictions of pride, doubt, greed, hate, and opinionatedness are systematically derived.
Brazier, David, Zen Therapy: Transcending the Sorrows of the Human Mind, 1995thesis
we see the simultaneous formation of the wish and the delusion of persecution developing from the obstacles to its fulfilment.
Bleuler demonstrates through case material that specific delusional content — including persecutory delusions — can be traced to wish-formation and the frustration of desire, anticipating psychoanalytic formulations.
Bleuler, Eugen, Dementia Praecox or the Group of Schizophrenias, 1911thesis
the direction of the delusion can originate only in psychic causes and our experience has proven that these causes are exclusively affective ones.
Bleuler insists that the vector of delusional formation is always determined by affective, not physiological or perceptual, causes, grounding even somatic delusions in psychological motivation.
Bleuler, Eugen, Dementia Praecox or the Group of Schizophrenias, 1911thesis
they behave in accordance with the trends of their delusions but without the least adaptation to reality, which they may otherwise still take into consideration.
Bleuler observes the paradox that delusional patients act on their delusions in ways entirely disengaged from reality, even while remaining capable of reality-adapted behavior in other domains, illustrating the splitting of the psyche.
Bleuler, Eugen, Dementia Praecox or the Group of Schizophrenias, 1911supporting
Personality and Delusion. The splitting of the personality is never more strikingly expressed than in the relation of the delusions to the remainder of the psyche.
Bleuler argues that the relationship between delusion and the rest of the personality is the most revealing index of schizophrenic splitting, with the delusional complex coexisting as a parallel psychic system.
Bleuler, Eugen, Dementia Praecox or the Group of Schizophrenias, 1911supporting
Many delusions recede into the background as a result of losing their emotional valence by being monotonously repeated. They then gradually cease to influence the patient's behavior.
Bleuler traces the natural history of delusions, noting that loss of affective charge — rather than correction by reality — is the primary mechanism by which delusions fade from behavioral influence.
Bleuler, Eugen, Dementia Praecox or the Group of Schizophrenias, 1911supporting
We repeatedly emphasized the fact that we considered him mentally ill and that his claims were based only on delusions. However, he nevertheless insisted that we had declared him sane.
Bleuler illustrates the characteristic imperviousness of delusional conviction to direct confrontation, even by clinical authority, demonstrating the closed logical world the delusion constructs.
Bleuler, Eugen, Dementia Praecox or the Group of Schizophrenias, 1911supporting
the spirit of delusion deceives the intellect through such spurious fantasies, especially at the early stages, in those who are still inexperienced.
The Philokalia identifies delusion as a spiritually operative force that deceives the intellect through fantasy, operating with particular power at the early stages of contemplative practice before discernment is cultivated.
Palmer, G. E. H. and Sherrard, Philip and Ware, Kallistos (trs.), The Philokalia, Volume 4, 1995supporting
Although it is known that they are empty, things are not destroyed, but one attends to one's affairs in the midst of the emptiness.
The Taoist tradition in Wilhelm treats delusion as the second of three contemplative stations — the recognition that phenomena persist even after their emptiness is known — positioning it as a necessary middle term in the path toward the center.
Wilhelm, Richard, The Secret of the Golden Flower: A Chinese Book of Life, 1931supporting
during her lengthy treatment, she could not be convinced that she had not been poisoned. She made her complaints in a completely stereotyped manner without extensive associations
Bleuler documents the stereotyped, affectively disconnected quality of somatic delusion, noting that the poisoning conviction remained impervious to evidence while the patient retained entirely normal intellectual function in other domains.
Bleuler, Eugen, Dementia Praecox or the Group of Schizophrenias, 1911supporting
Another form of negatively expressed erotic delusion is that of jealousy which, however, is not too frequent in schizophrenics unless complicated by alcoholism.
Bleuler situates jealousy delusion within the broader category of erotic delusion in schizophrenia, noting its relatively restricted frequency and common complication by alcoholism.
Bleuler, Eugen, Dementia Praecox or the Group of Schizophrenias, 1911supporting
their words do not come from the living spring of the Spirit, but are spawned from the morass of their own heart, a bog infested with the leeches, snakes and frogs of desire, delusion and dissipation
The Philokalia employs delusion as one term in a triad — alongside desire and dissipation — characterizing the spiritually self-generated speech that proceeds from self-conceit rather than from divine inspiration.
Palmer, G. E. H. and Sherrard, Philip and Ware, Kallistos (trs.), The Philokalia, Volume 4, 1995aside
even Zeus, whom people say is the very best of gods and humans, was once deluded. Hera, being female, tricked him by sneaky schemes
Homer's Iliad presents delusion as a universal condition afflicting even the supreme deity, employed here to frame the catastrophic consequences of Zeus's deception by Hera and the unboundedness of divine susceptibility to error.