Who said "I see no reason to alter my opinion."?

This quote is attributed to Sherlock Holmes.

I see no reason to alter my opinion. - Sherlock Holmes

"I see no reason to alter my opinion."

Sherlock Holmes

Character in The Hound of the Baskervilles

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

"The moor is a dangerous place, Watson."

"I cannot but think that you are justified in your caution."

"One should always look for a possible alternative."