Claude Bernard — French Scientist born on July 12, 1813, died on February 10, 1878

Claude Bernard was a French physiologist. Historian Ierome 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 blind experiments to ensure the objectivity of scientific observations. He was the first to define the term milieu intérieur, now known as homeostasis... (wikipedia)

Art is I; science is we.
Observation is a passive science, experimentation an active science.
The experimenter who does not know what he is looking for will not understand what he finds.
It is what we know already that often prevents us from learning.
Put off your imagination, as you put off your overcoat, when you enter the laboratory. Put it on again, as you put on your overcoat, when you leave.