Source: Into the Green (1993), Ch. 36 p. 233
Context: He had seen trances before — wise men far in the east, who could feign death; a herbwife as she bent over her patient, searching for invisible hurts.
But this was different. He could sense something here, within the circle cast by the light of the fire. A presence.
Presences...
“But Shakespeare's magic could not copied be;
Within that circle none durst walk but he.”
The Tempest, Prologue.
Bartlett's Familiar Quotations, 10th ed. (1919)
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John Dryden 196
English poet and playwright of the XVIIth century 1631–1700Related quotes

version in original Flemish (citaat van Roger Raveel, in het Vlaams): Het vierkant is een geestelijk geladen ding. Het is het product van de mens, het is niet afgekeken van de natuur zoals de cirkel.
Quote of Raveel, from his interview in the Dutch newspaper N.R.C., 1991; as cited by Din Pieters in 'Raveel: het vierkant als onbeschreven blad' https://www.nrc.nl/nieuws/1996/01/05/raveel-het-vierkant-als-onbeschreven-blad-7294323-a1018022, in N.R.C.-online, 5 Jan. 1996 (translation: Fons Heijnsbroek)
1990's

“We are magic. It is magic that we're walking around.”
Interview in Rolling Stone (9 November 1967)
Context: We are magic. It is magic that we're walking around. It's fantastic magic. Some people would call it miracles; I like to call it magic. … Yes, I'm very aware of this. Yes, the more aware I get, the more I can understand how big it is, how big it will get. It'll be harder to comprehend; that's why I have to go along with it, 'cause its so vast. To say to somebody that God is everything that lives and ever has lived and ever will live, and you're never going to touch and see, smell and be everything that is God. Magic is very hard to comprehend. <!-- Everyone's on their own, but they're not.
“Munitions and magic are circles that don’t intersect very effectively.”
Source: Black Easter (1968), Chapter 2 (p. 36)

Interview in the Guardian http://education.guardian.co.uk/higher/profile/story/0,11109,1092253,00.html