Who said "Imagination is the only thing that cannot be frozen."?

This quote is attributed to Mr. Freeze.

Imagination is the only thing that cannot be frozen. - Mr. Freeze

"Imagination is the only thing that cannot be frozen."

Mr. Freeze Imagination

"I'm not a human anymore. I'm something... colder."

"My wife, Nora... she's all that matters to me."

"Vengeance is a cold dish best served frozen."

"The cold never bothered me anyway."

"Imagination is more powerful than knowledge."

"The world is full of wonders if you know where to look."

"You have the imagination of a child, Lucy"

"The world is full of mysteries waiting to be solved."