Source: Intuitions and Summaries of Thought (1862), Volume I, p. 143; quoted in Criminal Minds, "The Crossing" [episode 3.18].
“There are many kinds of delusion.”
Source: The Neverending Story
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Michael Ende 26
German author 1929–1995Related quotes

“That's kind of what trust is, isn't it? A willful self-delusion.”
Source: The Final Empire

This is attributed to Pirsig by Richard Dawkins in the Preface to The God Delusion (2006), p. 28, but cannot be found prior to that. It is obviously a paraphrase of the following from Pirsig's Lila - An Inquiry Into Morals (1991): „An insane delusion can't be held by a group at all. A person isn't considered insane if there are a number of people who believe the same way. Insanity isn't supposed to be a communicable disease. If one other person starts to believe him, or maybe two or three, then it's a religion." ( books.google http://books.google.de/books?id=51i6WkGn6qYC&q=%22An+insane+delusion%22; books.google http://books.google.de/books?id=WZtRAQAAQBAJ&pg=PA426)
Disputed
Source: Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values

Source: Paths to Otherwhere (1996), Ch. 18
Context: What the Buddhists teach is to free yourself from the three great evils in life: greed — which means all kinds of craving — hatred, and delusion. But delusion is really the cause of the other two. We crave that which we delude ourselves into thinking will bring happiness; we hate those whom we delude ourselves into thinking stand to stop us from getting it.

The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.

“There are many kinds of gods. Therefore there are many kinds of men.”
“One and Many,” p. 3
Do What You Will (1928)

“There are as many kinds of love, as there are hearts”
Source: Anna Karenina