"A dog reflects the family life. Whoever saw a frisky dog in a gloomy family, or a sad dog in a happy one? Snarling people have snarling dogs, dangerous people have dangerous ones."
"They say that genius is an infinite capacity for taking pains," he remarked with a smile. "It's a very bad definition, but it does apply to detective work."
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Source: Sir Arthur Conan Doyle (2013). “Collected Works of Sir Arthur Conan Doyle (Delphi Classics)”, p.40, Delphi Classics
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