“No man burdens his mind with small matters unless he has some very good reason for doing so.”
“When a doctor does go wrong, he is the first of the criminals. He has the nerve, and he has the knowledge.”
“I am the last and highest court of appeal in detection.”
“It may be that you are not yourself luminous, but that you are a conductor of light. Some people, without possessing genius, have a remarkable power of stimulating it.”
“I am the most incurably lazy devil that ever stood in shoe leather.”
"Crime is common. Logic is rare. Therefore, it is upon the logic rather than upon the crime that you should dwell.”
“The world is full of obvious things that nobody by any chance ever observes.”