Who said "One's mind can play such tricks"?

This quote is attributed to Dr. John Watson.

One's mind can play such tricks - Dr. John Watson

"One's mind can play such tricks"

Dr. John Watson

Character in The Hound of the Baskervilles

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"I am not a very good subject for a novelist."

"The greatest happiness the greatest number."

"We are not beaten yet."

"Justice, however delayed, is not denied."