Those who cavalierly reject the Theory of Evolution, as not adequately supported by facts, seem quite to forget that their own theory is supported by no facts at all. Like the majority of men who are born to a given belief, they demand the most rigorous proof of any adverse belief, but assume that their own needs none.

"The Development Hypothesis", first published in The Leader (20 March 1852), later published in various editions of Essays: Scientific, Political and Speculative (1852).