Who said "The mind is a powerful instrument, John. Use it."?

This quote is attributed to Sherlock Holmes.

The mind is a powerful instrument, John. Use it. - Sherlock Holmes

"The mind is a powerful instrument, John. Use it."

Sherlock Holmes Education

"The game is afoot!"

"Elementary, my dear Watson."

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

"I am not a romantic, but I am a realist."

"Education opens doors."

"Education opens doors to endless possibilities."

"I ain't got the education you got, bub."

"You can't put a price on history."