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At the time I often wondered whether I should ever come out at the other end of the tunnel in which I seemed to be. I used to stand on the footbridge at Kennington, near Oxford, watching the trains go by, and determining that tomorrow I would place myself under one of them. But when the morrow came I always found myself hoping that perhaps Principia Mathematica would be finished some day.
Source: The Autobiography of Bertrand Russell, v.1
More info.: https://russell-j.com/beginner/AB16-150.HTM