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In psychiatry delusional ideas stand alongside obsessional ideas as purely intellectual disorders, and paranoia stands alongside obsessional insanity as an intellectual psychosis. If once obsessions have been traced back to an affective disturbance and it has been proved that they owe their strength to a conflict, then the same view must apply to delusions and they too must be the outcome of affective disturbances and must owe their strength to a psychological process.

The contrary of this is accepted by psychiatrists, while laymen are inclined to attribute delusional insanity to shattering emotional