Delusion

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DELUSION, med. jurisp. A diseased state of the mind, in which persons believe things to exist, which exist only, or in the degree they are conceived of only in their own imaginations, with a persuasion so fixed and firm, that neither evidence nor argument can convince them to the contrary.
     2. The individual is, of course, insane. For example, should a parent unjustly persist without the least ground in attributing to his daughter a course of vice, and use her with uniform unkindness, there not being the slightest pretence or color of reason for the supposition, a just inference of insanity, or delusion, would arise in the minds of a jury: because a supposition long entertained and persisted in, after argument to the contrary, and against the natural affections of a parent, suggests that he must labor under some morbid mental delusion. 3 Addams' R. 90, 91; Id. 180; Hagg. R. 27 and see Dr. Connolly's Inquiry into Insanity, 384; Ray, Med. Jur. Prel. Views., Sec. 20, p. 41, and Sec. 22, p. 47; 3 Addams, R. 79; 1 Litt. R. 371 Annales d'Hygiene Publique, tom. 3, p. 370; 8 Watts, 70; 13 Ves. 89; 1 Pow. Dev. by Jarman, 130, note Shelf. on Lun. 296; 2 Bouv. Inst. n. 2104-10.

References in classic literature ?
It is one among my other delusions to believe that I am still perfectly capable of taking care of myself.
Delusions which have been the stealthy growth of years?
Backward they always gaze toward dark ages: then, indeed, were delusion and faith something different.
The resulting delusions in very many cases disappear if the hysteric or lunatic can be made to face the facts about himself.
On this question of the study of delusions, the practical effect of the modern theories, as Dr.
These ladies remain ladies to you, and to themselves, and to everybody else; and at the same time they will suffer in no way from my delusion, for when I know that an ostensible hog is a lady, that is enough for me, I know how to treat her."
It is plain, then, that phrenologically the head of this Leviathan, in the creature's living intact state, is an entire delusion. As for his true brain, you can then see no indications of it, nor feel any.
It was an ugly story of low passion, delusion, and waking from delusion, which needs not to be dragged from the privacy of Godfrey's bitter memory.
"If you persist in returning to your delusion," she said, "you will oblige me to persist in returning to my papers."
"Your delusion is expressed in the questions you have just put to me.
I would go out into the streets to fight with my delusion, and prowling women would mew after me; furtive, craving men glance jealously at me; weary, pale workers go coughing by me with tired eyes and eager paces, like wounded deer dripping blood; old people, bent and dull, pass murmuring to themselves; and, all unheeding, a ragged tail of gibing children.
With the partial recovery of his animation came the return of his wonderful delusion on the subject of swimming.