There comes a time when for every addition of knowledge you forget something that you knew before. It is of the highest importance, therefore, not to have useless facts elbowing out the useful ones. It is a capital mistake to theorize before you have all the evidence. It biases the judgment. When you have eliminated the impossible, whatever remains, however improbable, must be the truth.
Mediocrity knows nothing higher than itself, but talent instantly recognizes genius.
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