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"A conscientious moralist or churchman would not consider meddling in controversies concerning technological or therapeutical methods without having sufficiently familiarized himself with all the physical, chemical and physiological problems involved. Yet many of them think that ignorance of economics is no bar to handling economic issues."
He's right on this front.

"Scientists may disagree about theories. They never lastingly disagree about the establishment of what is called pure facts. There can be no dispute as to whether a definite piece of stuff is copper or iron or its weight is two pounds or five."