For those who asked, here is the exact quote from Travels with my Aunt.

"There speaks a Protestant," Mr Visconti said.
"Any Catholic knows that a legend which is believed has the same value and
effect as the truth.  Look at the cult of the saints."
"But the Americans may be Protestants".
"Then we produce medical evidence.  That is the modern form of the
legend..."
        —Graham Greene. Travels with My Aunt"

Jack Newman, MD, FRCPC

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