Claude Bernard

Claude Bernard (July 12, 1813 February 10, 1878) was a French physiologist. He was called by Prof. I. Bernard Cohen of Harvard University, "one of the greatest of all men of science" in his Forward to the Dover edition (1957) of Bernard's classic on scientific method, An Introduction to the Study of Experimental Medicine (originally published in 1865).

2 Quotes

A fact in itself is nothing. It is valuable only for the idea attached to it, or for the proof which it furnishes.
— Claude Bernard

It is what we think we know already that often prevents us from learning.
— Claude Bernard