Who said "The individual is stronger than you know"?

This quote is attributed to Mrs. Which.

The individual is stronger than you know - Mrs. Which

"The individual is stronger than you know"

Mrs. Which Power

Character in A Wrinkle in Time

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"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."