“Reality exists in the human mind, and nowhere else. Not in the individual mind, which can make mistakes, and in any case soon perishes: only in the mind of the Party, which is collective and immortal.”

Heath's book of Beauty, 1833 (1832)

Source: A New Earth: Awakening to Your Life's Purpose

Source: Mind is a Myth (1987), Ch. 1: The Certainty That Blasts Everything
Context: Our mind (and there are no individual minds — only "mind", which is the accumulation of man's knowledge and experience) has created the notion of the psyche and evolution. Only technology progresses, while we as a race are moving closer to complete and total destruction of the world and ourselves. Everything in man's consciousness is pushing the whole world, which nature has so laboriously created, toward destruction. There has been no qualitative change in man's thinking; we feel about our neighbours just as the frightened caveman felt towards his. The only thing that has changed is our ability to destroy our neighbor and his property.

Profile of Yuri Knorozov http://cemyk.org/pages/en/yuri-knorosov.php

A comment on Wrong Questions http://lesswrong.com/lw/og/wrong_questions/ (March 2008)
Context: Mystery exists in the mind, not in reality. If I am ignorant about a phenomenon, that is a fact about my state of mind, not a fact about the phenomenon itself. All the more so, if it seems like no possible answer can exist: Confusion exists in the map, not in the territory. Unanswerable questions do not mark places where magic enters the universe. They mark places where your mind runs skew to reality.

"Quotes", The Educated Imagination (1963), Talk 3: Giants in Time

Cette harmonie que l’intelligence humaine croit découvrir dans la nature, existe-t-elle en dehors de cette intelligence ? Non, sans doute, une réalité complètement indépendante de l’esprit qui la conçoit, la voit ou la sent, c’est une impossibilité.
Introduction, p. 14
The Value of Science (1905)