“Your thoughts are too dull to entertain.”

“Henri Bergson thought the principal function of the brain was to filter out most of reality so that we could focus on the tasks of earthly life,” he said. “When the filter is weakened by a powerful drug, what we see is not delusion but the truth.”

“Your mother's in here, Karras. Would you like to leave a message? I'll see that she gets it.”

“...the exorcist should not believe too readily that a person is possessed by an evil spirit; but he aught to ascertain by the signs by which a person possessed can be distinguished from one who is suffering from some illness; especially one of a psychological nature. Signs of possession may be the following: ability to speak with some facility in a strange language or to understand it when spoken by another; the facility of divulging future and hidden events; display of powers shich are beyond the subject's age and natural condition; and various other conditions which, when taken together as a whole, build up the evidence.”

“Perhaps evil is the crucible of goodness... and perhaps even Satan - Satan, in spite of himself - somehow serves to work out the will of God.”

“The terror drifted over georgetown like the sun over a blind mans eyes”

“Her shoes were comfortable. They reflected her hope for the evening.”