Facts do not "speak for themselves"; they are read in the light of theory. Creative thought, in science as much as in the arts, is the motor of changing opinion. Science is a quintessentially human activity, not a mechanized, robotlike accumulation of objective information, leading by laws of logic to inescapable interpretation.
Ever Since Darwin: Reflections in Natural History, Chapter 20 The Validation of Continental Drift (pp. 161-162), W.W. Norton & Company, Inc. 1977