Who said "The only power that exists is inside ourselves"?

This quote is attributed to Matilda Wormwood.

The only power that exists is inside ourselves - Matilda Wormwood

"The only power that exists is inside ourselves"

Matilda Wormwood Strength

Character in Matilda

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"A young girl with a love of books can change her own destiny"

"Intelligence combined with kindness is a powerful force"

"I'm made of sterner stuff than that"

"Books are a plane, and a train, and a road. They are a destination, and a journey"

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."