Delusion (n.) al ideas (n.) are opinions that seem to come from real perception but thrust themselves up from unconscious factors within.
Delusion (n.) al ideas (n.) are greater than all physical dangers: no 'real' thought cannot be thrust aside by an 'unreal' one, and our vaunted reason and overestimated will are sometimes utterly powerless before them.
A Delusion (n.) is a real psychic fact even when its content is nonsense; psychology studies the fact and leaves the nonsense alone.
A Delusion (n.) is, in hysteria, a displacement whose affect really belongs to a repressed complex it disguises, as a woman sure her tooth extraction damned her was hiding a far older secret; Jung saw the same process in dementia praecox.
A Delusion (n.) cannot be explained in its own terms, only through knowledge of the normal mind; doctors who lack the epistemology tend to fill the gaps with professions of faith.