Who said "Darkness cannot exist where there is love"?

This quote is attributed to Mrs. Whatsit.

Darkness cannot exist where there is love - Mrs. Whatsit

"Darkness cannot exist where there is love"

Mrs. Whatsit Love

Character in A Wrinkle in Time

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"A tesseract is a wrinkle in time"

"You must go alone"

"The only way to cope with something deadly serious is to treat it a little lightly"

"Evil is powerless if the good are unafraid"

"I love my wife, but sometimes she drives me crazy."

"Love conquers all obstacles."

"Love is patient, love is kind."

"I'm not stupid, I'm just in love!"