“Perhaps the most concise summary of enlightenment would be: transcending dualism. … Dualism is the conceptual division of the world into categories … human perception is by nature a dualistic phenomenon—which makes the quest for enlightenment an uphill struggle, to say the least.”
Source: Gödel, Escher, Bach: an Eternal Golden Braid (1979), Chapter 9: "Mumon and Gödel"
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Douglas Hofstadter 17
American professor of cognitive science 1945Related quotes

“There is a radical dualism between the empirical nature of man and its moral nature.”
Source: Words of a Sage : Selected thoughts of African Spir (1937), p. 59.

"New Maps of Hyperspace" (1989); originally published in Magical Blend magazine, also in The Archaic Revival: Speculations on Psychedelic Mushrooms, the Amazon, Virtual Reality, UFOs, Evolution, Shamanism, the Rebirth of the Goddess, and the End of History (1992)]
Context: The alternative physics is a physics of light. Light is composed of photons, which have no antiparticle. This means that there is no dualism in the world of light. The conventions of relativity say that time slows down as one approaches the speed of light, but if one tries to imagine the point of view of a thing made of light, one must realize that what is never mentioned is that if one moves at the speed of light there is no time whatsoever. There is an experience of time zero. … The only experience of time that one can have is of a subjective time that is created by one's own mental processes, but in relationship to the Newtonian universe there is no time whatsoever. One exists in eternity, one has become eternal, the universe is aging at a staggering rate all around one in this situation, but that is perceived as a fact of this universe — the way we perceive Newtonian physics as a fact of this universe. One has transited into the eternal mode. One is then apart from the moving image; one exists in the completion of eternity.

Queen Fredricka of Greece, wife of King Paul.Quoted from Gewali, Salil (2013). Great Minds on India. New Delhi: Penguin Random House.

"Platonic Justice", Ethics, April 1938. Translated by Glenn Negley from "Die platonische Gerechtigkeit," Kantstudien, 1933. (The author corrected the translation in 1957), published in What is Justice? (1957)

as quoted by John Freely, Before Gaileo: The Birth of Modern Science in Medieval Europe (2012)

Enlightenment
Song lyrics, Enlightenment (1990)