Who said "Fear is the best teacher, though it comes at a price."?

This quote is attributed to Agatha Harkness.

Fear is the best teacher, though it comes at a price. - Agatha Harkness

"Fear is the best teacher, though it comes at a price."

Agatha Harkness Fear

"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."

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."