When two men of science disagree, they do not invoke the secular arm; they wait for further evidence to decide the issue, because, as men of science, they know that neither is infallible. But when two theologians differ, since there are no criteria to which either can appeal, there is nothing for it but mutual hatred and an open or covert appeal to force.

Source:Has Religion Made Useful Contributions to Civilization? (June 1929)
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