Doesn't this sound like Doyle's depiction of Watson describing his own response to Sherlock Holmes? This quote is Plutarch describing Archimedes.
Some ascribe this to his natural genius; while others think that incredible effort and toil produced these, to all appearances, easy and unlabored results. No amount of investigation of yours would succeed in attaining the proof, and yet, once seen, you immediately believe you would have discovered it - by so smooth and so rapid a path he leads you to the conclusion . . . Such was Archimedes.
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