Who said "Fear is the darkness that dims our light"?

This quote is attributed to Mrs. Which.

Fear is the darkness that dims our light - Mrs. Which

"Fear is the darkness that dims our light"

Mrs. Which Fear

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"

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."