Who said "The only constant is change—adapt or perish."?

This quote is attributed to Agatha Harkness.

The only constant is change—adapt or perish. - Agatha Harkness

"The only constant is change—adapt or perish."

Agatha Harkness Change

"Well, hello, dearie."

"The real question is, what are you willing to do to keep what you love?"

"Power isn't given, it's taken."

"I'm not a witch. Well, not a traditional one anyway."

"Change brings new opportunities."

"Every day is a new opportunity."

"Healing doesn't mean forgetting."

"You either get better or you get bitter."