“We are lonesome animals. We spend all our life trying to be less lonesome. One of our ancient methods is to tell a story begging the listener to say — and to feel — "Yes, that’s the way it is, or at least that’s the way I feel it. You’re not as alone as you thought."”
— "In Awe of Words," The Exonian, 75th anniversary edition, Exeter University (1930)
“Ghosts could walk freely tonight, without fear of the disbelief of men; for this night was haunted, and it would be an insensitive man who did not know it.”
— Ch. 8
“His guard was up now and he wasn't listening; he was only angry because here was a world he could not enter and so he had to disbelieve in its existence. He fell back on the world he knew.”
— Act One: The Circus. "He" is Victor.
“"Ellen, only last night, asked, 'Daddy, when will we be rich?' But I did not say to her what I know: 'We will be rich soon, and you who handle poverty badly will handle riches equally badly.' And that is true. In poverty she is envious. In riches she may be a snob. Money does not change the sickness, only the symptoms."”
— Chapter VII
“This monster of a land, this mightiest of nations, this spawn of the future, turns out to be the macrocosm of microcosm me.”
— Pt. 3
“I have owed you this letter for a very long time — but my fingers have avoided the pencil as though it were an old and poisoned tool.”
— Letter to his literary agent, found on his desk after his death in 1968

Quotes via Wikiquote (CC BY-SA), each with its original source.