Who said "Change is the only constant in this world."?

This quote is attributed to Agatha Harkness.

Change is the only constant in this world. - Agatha Harkness

"Change is the only constant in this world."

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."