"Improving on what I wrote in Logics of Delusion, I would now say that the delusional subject believes in the immediate truth of what is compulsively revealed to him. In general, he has no suspicion that it may be false or illusory. This is also because he has remained intimately attached to the logic of desire, which cancels any contradiction between the possible and the impossible, the attainable and the unattainable, and because he has experienced this archaic logic as true even when the reality principle was imposed on his unwilling consciousness. In other words, he has not entirely made the transition from the logic of desire to that of the acceptance of bonds, to the logic of a relatively well-consolidated rationality."
Logics of Delusion, 2nd Edition