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The the question whether I am a pessimist or an optimist, I answer that my knowledge is pessimistic, but my willing and hope are optimistic.

Albert Schweitzer (1953). “Out of My Life and Thought: An Autobiography: Postscript 1932-1949 by Everett Skillings”
The the question whether I am a pessimist or an optimist, I answer that my knowledge is pessimistic, but my willing and hope are optimistic.