Who said "I fear that I must go."?

This quote is attributed to Sherlock Holmes.

I fear that I must go. - Sherlock Holmes

"I fear that I must go."

Sherlock Holmes

Character in The Adventures of Sherlock Holmes

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"You see, but you do not observe. The distinction is quite clear."

"Data, data, data! I can't make bricks without clay."

"The world is full of obvious things which nobody by any chance ever observes."

"When you have eliminated the impossible, whatever remains, however improbable, must be the truth."