“The electron is a theory we use; it is so useful in understanding the way nature works that we can almost call it real.”
Part 2: "The Princeton Years", "A Map of the Cat?", p. 70
Surely You're Joking, Mr. Feynman! (1985)
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Richard Feynman 181
American theoretical physicist 1918–1988Related quotes

Die Quantentheorie ist so ein wunderbares Beispiel dafür, daß man einen Sachverhalt in völliger Klarheit verstanden haben kann und gleichzeitig doch weiß, daß man nur in Bildern und Gleichnissen von ihm reden kann.
Der Teil und das Ganze. Gespräche im Umkreis der Atomphysik (1969); also in "Kein Chaos, aus dem nicht wieder Ordnung würde", Die Zeit No. 34 (22 August 1969) http://www.zeit.de/1969/34/kein-chaos-aus-dem-nicht-wieder-ordnung-wuerde/komplettansicht; as translated in Physics and Beyond : Encounters and Conversation (1971)
Source: Four Arguments for the Elimination of Television (1978), p. 87

In letter to California State board of Education (14 September 1972)
“Time works so hard for us, if only we can let it.”
Source: The Likeness

Divine Action: An Interview with John Polkinghorne http://www.aril.org/polkinghorne.htm by Lyndon F. Harris in Cross Currents, Spring 1998, Vol. 48 Issue 1.

Who is Lucifer?
The Lucifer Principle: A Scientific Expedition Into the Forces of History (1997)

“Home life as we understand it is no more natural to us than a cage is natural to a cockatoo.”
Preface
1900s, Getting Married (1908)