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"I never guess. It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts."

"'How often have I said to you that when you have eliminated the impossible, whatever remains, however improbable, must be the truth?"

"It is my belief, Watson, founded upon my experience, that the lowest and vilest alleys in London do not present a more dreadful record of sin than does the smiling and beautiful countryside."

"It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts."

"There was something awesome in the thought of the solitary mortal standing by the open window and summoning in from the gloom outside the spirits of the nether world."

"This is quite a three-pipe problem."

"He was a genius - that is to say, a man who does superlatively and without obvious effort something that most people cannot do by the uttermost exertion of their abilities."

"Men of genius do not excel in any profession because they labor in it, but they labor in it because they excel."

"Genius hath electric power which earth can never tame."

"There is no great genius without some touch of madness."

"The public is wonderfully tolerant. It forgives everything except genius."

"Genius might be described as a supreme capacity for getting its possessors into trouble of all kinds."