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Quotation from An Introduction to the Study of Experimental Medicine by Claude Bernard
“The great experimental principle, then, is doubt, that philosophic doubt which leaves to the mind its freedom and initiative, and from which the virtues most valuable to investigators in physiology and medicine are derived.”
An Introduction to the Study of Experimental Medicine, Part One, Chapter II, trans. Henry Copley Greene (1927)

Bernard sums up his account of how the experimenter should hold his own ideas.
Citation: "The great experimental principle, then, is doubt, that philosophic doubt which leaves to the mind its freedom and initiative, and from which the virtues most valuable to investigators in physiology and medicine are derived." — Claude Bernard, An Introduction to the Study of Experimental Medicine, Part One, Chapter II, trans. Henry Copley Greene (1927). (id bernard-introduction-to-experimental-medicine-q2)
Portrait: Claude Bernard 5, Unknown, Public domain.
