“I abandoned the extraterrestrial hypothesis in 1967 when my own field investigations disclosed an astonishing overlap between psychic phenomena and UFOs … The objects and apparitions do not necessarily originate on another planet and may not even exist as permanent constructions of matter. It is more likely that we see what we want to see and interpret such visions according to our contemporary beliefs.”
http://www.ufoevidence.org/Researchers/Detail71.htm
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John A. Keel 3
American writer 1930–2009Related quotes

"On the Physiological Causes of Harmony" (1857), p. 81
Popular Lectures on Scientific Subjects (1881)
Context: Now it is a universal law of the perceptions obtained through the senses that we pay only so much attention to the sensations actually experienced as is sufficient for us to recognise external objects. In this respect we are very one-sided and inconsiderate partisans of practical utility; far more so indeed than we suspect. All sensations which have no direct reference to external objects, we are accustomed, as a matter of course, entirely to ignore, and we do not become aware of them till we make a scientific investigation of the action of the senses, or have our attention directed by illness to the phenomena of our own bodies. Thus we often find patients, when suffering under a slight inflammation of the eyes, become for the first time aware of those beads and fibres known as mouches volantes swimming about within the vitreous humour of the eye, and then they often hypochondriacally imagine all sorts of coming evils, because they fancy that these appearances are new, whereas they have generally existed all their lives.

as quoted in Letters of the great artists – from Ghiberti to Gainsborough, Richard Friedenthal, Thames and Hudson, London, 1963, p . 232
1908 - 1920, On Mystery and Creation, Paris 1913

Pages 12-13
Other writings, The Nature of the Judicial Process (1921)
Context: There is in each of us a stream of tendency, whether you choose to call it philosophy or not, which gives coherence and direction to thought and action. Judges cannot escape that current any more than other mortals. All their lives, forces which they do not recognize and cannot name, have been tugging at them — inherited instincts, traditional beliefs, acquired convictions; and the resultant is an outlook on life, a conception of social needs. … In this mental background every problem finds it setting. We may try to see things as objectively as we please. None the less, we can never see them with any eyes except our own.

1981 - 2008
Source: 'Colour Chart I', interview with Christoph Grunenberg, 1 May 2009; 'Sixty years at full intensity', Tate 2009

volume I; lecture 35, "Color Vision"; 35-1 "The human eye"; p. 35-1
The Feynman Lectures on Physics (1964)