Who said "Your differences make you valuable"?

This quote is attributed to Calvin O'Keefe.

Your differences make you valuable - Calvin O'Keefe

"Your differences make you valuable"

Calvin O'Keefe Kindness

Character in A Wrinkle in Time

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"You must be very brave."

"A good man treats his wife with respect."

"Kindness always comes back around."

"The power of a smile can change everything."

"Kindness is weakness to some. Not to me."