From C. S. Lewis's Miracles: A Preliminary Study.
“The ordinary procedure of the modern historian even if he admits the possibility of miracle, is to admit no particular instance of it until every possibility of “natural” explanation has been tried and failed. That is, he will accept the most improbable “natural” explanations rather than say that a miracle occurred. Collective hallucination, hypnotism or unconsenting spectators, widespread instantaneous conspiracy in lying by persons not otherwise known to be liars and not likely to gain by the lie — all these are known to be very improbable events: so improbable that, except for the special purpose of excluding a miracle, they are never suggested. But they are preferred to the admission of a miracle.” (C.S. Lewis, Miracles, p. 133)