Who said "We must have faith in what we cannot see"?

This quote is attributed to Mrs. Which.

We must have faith in what we cannot see - Mrs. Which

"We must have faith in what we cannot see"

Mrs. Which Faith

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"

"Faith guides me through difficult times."

"Faith is believing when you can't see."

"You have to believe in something, or you'll fall for anything."

"Faith in God and in each other is what sustains us"