Who said "Strength is not measured in muscle, but in will."?

This quote is attributed to Mr. Freeze.

Strength is not measured in muscle, but in will. - Mr. Freeze

"Strength is not measured in muscle, but in will."

Mr. Freeze Strength

"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."

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."