William K. Clifford, Contemporary Review, (1877); reprinted in William K. Clifford, Lectures and Essays, ed. Leslie Stephen and Frederick Pollock (London: Macmillan and Co., 1886).William K. Clifford (1845–1879) was an English mathematician.
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The sincerity of his conviction can in no wise help him, because he had no right to believe on such evidence as was before him. He had acquired his belief not by honestly earning it in patient investigation, but by stifling his doubts. And although in the end he may have felt so sure about it that he could not think otherwise, yet inasmuch as he had knowingly and willingly worked himself into that frame of mind, he must be held responsible for it.