Intellectually, the month of September 1900 was the highest point of my life. I went about saying to myself that now at last I had done something worth doing, and I had the feeling that I must be careful not to be run over in the street before I had written it down.
With the beginning of October I sat down to write The Principles of Mathematics, ...
Source: The Autobiography of Bertrand Russell, v.1
More info.: https://russell-j.com/beginner/AB15-160.HTM
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