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But the two summers of 1903 and 1904 remain in my mind as a period of complete intellectual deadlock. It was clear to me that I could not get on without solving the contradictions, and I was determined that no difficulty should turn me aside from the completion of Principia Mathematica, but it seemed quite likely that the whole of the rest of my life might be consumed in looking at that blank sheet of paper. What made it the more annoying was that the contradictions were trivial, and that my time was spent in considering matters that seemed unworthy of serious attention.
Source: The Autobiography of Bertrand Russell, v.1
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