Who said "Knowledge is power, but ignorance is bliss."?

This quote is attributed to Hermione Granger.

Knowledge is power, but ignorance is bliss. - Hermione Granger

"Knowledge is power, but ignorance is bliss."

Hermione Granger Knowledge

Character in Harry Potter and the Chamber of Secrets

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"Just because you have the emotional range of a teaspoon."

"Honestly, the way you two carry on, you'd think the world was ending."

"Polyjuice Potion was my idea."

"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."