Who said "Strength isn't measured in power, but in character."?

This quote is attributed to Jean Grey.

Strength isn't measured in power, but in character. - Jean Grey

"Strength isn't measured in power, but in character."

Jean Grey Strength

"I can hear them. All of them. I can't shut them out."

"With great power comes great responsibility."

"I'm not just a telepath. I'm so much more than that."

"We're not monsters. We're just different."

"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."