Claude Bernard Quotes
Man does not limit himself to seeing; he thinks and insists on learning the meaning of phenomena whose existence has been revealed to him by observation. So he reasons, compares facts, puts questions to them, and by the answers which he extracts, tests one by another. This sort of control, by means of reasoning and facts, is what constitutes experiment, properly speaking; and it is the only process that we have for teaching ourselves about the nature of things outside us.
Bernard, Claude. An Introduction to the Study of Experimental Medicine. Translated by Henry Copley Greene, Macmillan, 1927, p. 13.
Claude Bernard was a French physiologist. Historian I. Bernard Cohen of Harvard University called Bernard "one of the greatest of all men of science". Among many other accomplishments, he was one of the first to suggest the use of a blinded experiment to ensure the objectivity of scientific observations. He originated the term milieu intérieur, and the associated concept of homeostasis (the latter term being coined by Walter Cannon).