When I compare my last discoveries–relating to the constitution of the atmosphere–with the first, I see the closest and easiest connexion in the world between them, so as to wonder that I should not have been led immediately from the one to the other. That this was not the case, I attribute to the force of prejudice, which unknown to ourselves, biases not only our judgments, properly so called, but even the perception of our senses: for we may take a maxim so strongly for granted, that the plainest evidence of sense will not entirely change, and often hardly modify, our persuasions; and the more ingenious a man is, the more effectually he is entangled in his errors, his ingenuity only helping him to deceive himself, by evading the force of truth.
Gibbs, F.W., 1965. Joseph Priestley: Adventurer in Science and Champion of Truth, p. 119. Thomas Nelson and Sons Ltd. London, as cited in: Gaither, C.C. and Cavazos-Gaither, A.E., 2008. Gaither’s Dictionary of Scientific Quotations. ISBN: 978-0-387-49575-0. Springer.