Who said "The mind is a powerful weapon when used properly."?

This quote is attributed to Remus Lupin.

The mind is a powerful weapon when used properly. - Remus Lupin

"The mind is a powerful weapon when used properly."

Remus Lupin Knowledge

Character in Harry Potter and the Prisoner of Azkaban

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"Dementors are among the foulest creatures that walk this earth."

"You're a true wizard, Harry."

"Understanding is the first step to acceptance."

"It is important to ask for help when you need it."

"We're not just after treasure. We're preserving history."

"The mind is humanity's greatest tool."

"A tidy room reflects a tidy mind."

"You can learn a lot about a person by how they keep their space."