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You cannot raise the standard against oppression, or leap into the breach to relieve injustice, and still keep an open mind to every disconcerting fact, or an open ear to the cold voice of doubt. I am satisfied that a scholar who tries to combine these parts sells his birthright for a mess of pottage; that, when the final count is made, it will be found that the impairment of his powers far outweighs any possible contribution to the causes he has espoused.