"A private man has always the liberty (because thought is free) to believe or not believe in his heart those acts that have been given out for miracles, according as he shall see what benefits can accrue by men's belief, to those that pretend, or countenance them, and thereby conjecture whether they be miracles or lies."

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Nothing is known in our profession by guess; and I do not believe, that from the first dawn of medical science to the present moment, a single correct idea has ever emanated from conjecture: it is right therefore, that those who are studying their profession should be aware that there is no short road to knowledge; and that observation on the diseased living, examination of the dead, and experiments upon living animals, are the only sources of true knowledge; and that inductions from these are the sole bases of legitimate theory.

— Astley Cooper