A delusion is a belief that is held with strong conviction despite evidence disproving it that is stronger than any evidence supporting it. It is distinct from an erroneous belief caused by incomplete information (misconception or misunderstanding), deficient memory (confabulation) or incorrect perception (illusion). The psychiatrist and philosopher Karl Jaspers proposed 3 criteria for delusional beliefs in 1913: certainty (the belief is held with absolute conviction), incorrigibility (the belief cannot be changed with any proof to the contrary) and impossibility or falsity (the belief cannot be true) (Jaspers, 1967). Delusions are associated with a variety of mental and neurological disorders, but are of diagnostic importance in the psychotic disorders.
You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.
You cannot over estimate the unimportance of nearly everything. John Maxwell
