“Depend upon it 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.”
Other Arthur Conan Doyle Quotes
You will, I am sure, agree with me that... if page 534 only finds us in the second chapter, the length of the first one must have been really intolerable.
Arthur Conan Doyle 
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Of all ghosts the ghosts of our old loves are the worst.
Arthur Conan Doyle
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As Cuvier could correctly describe a whole animal by the contemplation of a single bone, so the observer who has thoroughly understood one link in a series of incidents should be able to accurately state all the other ones, both before and after.
Arthur Conan Doyle
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I have frequently gained my first real insight into the character of parents by studying their children.
Arthur Conan Doyle
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There is nothing more deceptive than an obvious fact.
Arthur Conan Doyle
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