“Disturbance comes only from within—from our own perceptions.”
Hays translation
IV, 4
Meditations (c. AD 121–180), Book IV
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Marcus Aurelius 400
Emperor of Ancient Rome 121–180Related quotes

Source: What is Anthropology? (2nd ed., 2017), Ch. 9 : Social Identity

OM Chanting and Meditation (2010) http://books.google.co.uk/books/about/OM_Chanting_and_Meditation.html?id=3KKjPoFmf4YC,

Source: Longing for the Harmonies: Themes and Variations from Modern Physics (1987), Ch.32 Hidden Harmonies

The Believer interview (2013)
Context: Yeah, our view of reality, the one we conventionally take, is one among many. It’s pretty much a fact that our entire universe is a mental construct. We don’t actually deal with reality directly. We simply compose a picture of reality from what’s going on in our retinas, in the timpani of our ears, and in our nerve endings. We perceive our own perception, and that perception is to us the entirety of the universe. I believe magic is, on one level, the willful attempt to alter those perceptions. Using your metaphor of an aperture, you would be widening that window or changing the angle consciously, and seeing what new vistas it affords you.
Source: Mind and Nature, a necessary unity, 1988, p. 74-75

“Memory is a reenactment of perception, indistinguishable from the original act of knowing.”
Out of Control: The New Biology of Machines, Social Systems and the Economic World (1995)