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Ethan Allen
1738 - 1789
American revolutionary

Those who invalidate reason ought seriously to consider whether they argue against reason with or without reason; if with reason, then they establish the principle that they are laboring to dethrone: but if they argue without reason (which, in order to be consistent with themselves they must do), they are out of reach of rational conviction, nor do they deserve a rational argument.

quoted in The Demon-Haunted World, by Carl Sagan