Who said "The power of belief shapes reality"?

This quote is attributed to Mrs. Which.

The power of belief shapes reality - Mrs. Which

"The power of belief shapes reality"

Mrs. Which Power

Character in A Wrinkle in Time

Buy "A Wrinkle in Time" on Amazon

"The mind power of evil is great"

"Your father needs you"

"IT thinks with the brains"

"Evil requires conformity"

"Power without control is just destruction."

"Power is not about control, it's about influence"

"The world doesn't need me to be the hero. It just needs me to be dangerous."

"The claws come out when I need them to."