This statement was made before the public learned that Margaret, and not Walter, was the painter of the Big Eyed waifs.
Interviewed https://www.youtube.com/watch?v=9WgStC6fvtM by Gary E. Park (circa 1964).
Walter Keane
“The scientist has a lot of experience with ignorance and doubt and uncertainty, and this experience is of very great importance, I think.”
The Value of Science (1955)
Context: The scientist has a lot of experience with ignorance and doubt and uncertainty, and this experience is of very great importance, I think. When a scientist doesn’t know the answer to a problem, he is ignorant. When he has a hunch as to what the result is, he is uncertain. And when he is pretty darn sure of what the result is going to be, he is still in some doubt. We have found it of paramount importance that in order to progress we must recognize our ignorance and leave room for doubt. Scientific knowledge is a body of statements of varying degrees of certainty — some most unsure, some nearly sure, but none absolutely certain. Now, we scientists are used to this, and we take it for granted that it is perfectly consistent to be unsure, that it is possible to live and not know. But I don’t know whether everyone realizes this is true. Our freedom to doubt was born out of a struggle against authority in the early days of science. It was a very deep and strong struggle: permit us to question — to doubt — to not be sure. I think that it is important that we do not forget this struggle and thus perhaps lose what we have gained.
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Richard Feynman 181
American theoretical physicist 1918–1988Related quotes

Great Books: The Foundation of a Liberal Education (1954)

“No great importance is to be given to mere experience.”
In Vikram A. Sarabhai, 19 August 2002, 14 December 2013, OutlookIndia http://www.outlookindia.com/article.aspx?216858,
Interview with Elizabeth Gips http://www.tripzine.com/articles.asp?id=dmturnergips

Foreword : Reflections on A Preface to Democratic Theory
A Preface to Democratic Theory (Expanded ed., 2006)

"Notice sur Halphen," Journal de l'École Polytechnique (Paris, 1890), 60ème cahier, p. 143. See also Tobias Dantzig, Henri Poincaré, Critic of Crisis: Reflections on His Universe of Discourse (1954) p. 8
Context: A scientist worthy of the name, above all a mathematician, experiences in his work the same impression as an artist; his pleasure is as great and of the same nature.... we work not only to obtain the positive results which, according to the profane, constitute our one and only affection, as to experience this esthetic emotion and to convey it to others who are capable of experiencing it.

Matthew Stewart, The Courtier and the Heretic (2006)
Context: For Spinoza, philosophy originates in the very personal... feeling of emptiness that in the philosophical tradition has earned the distinguished name of contemptu mundi, the contempt for worldly things, or, better, vanitas.... Spinoza says that... success in life is just a postponement of failure;... pleasure is just a fleeting respite from pain; and... the objects of our striving are vain illusions....
The feeling of vanitas Spinoza describes is... a dire encounter with the prospect of descent into absolute nothingness, a life without significance coming to a meaningless end.... The experience Spinoza records... establishes... the moment of extreme doubt, fear, and uncertainty that precedes the dawn of revelation.... the journey... is one trodden by poets, philosophers, and theologians too numerous to mention, who for millennia have recorded this feeling that life is a useless passion, a wheel of ceaseless striving, a tale told by an idiot, full of sound and fury, signifying nothing, and so on.<!--pp. 55-56