Who said "I refuse to accept that a man cannot change."?

This quote is attributed to George Costanza.

I refuse to accept that a man cannot change. - George Costanza

"I refuse to accept that a man cannot change."

George Costanza Change

"I'm out there Jerry, and I'm lovin' every minute of it."

"These pretzels are making me thirsty."

"Master of my domain."

"It's not a lie if you believe it."

"Change brings new opportunities."

"Every day is a new opportunity."

"Healing doesn't mean forgetting."

"You either get better or you get bitter."