Who said "Everything changes. That's the only constant."?

This quote is attributed to Cristina Yang.

Everything changes. That's the only constant. - Cristina Yang

"Everything changes. That's the only constant."

Cristina Yang Change

"I'm not just a female surgeon. I'm a surgeon."

"You don't have to see the whole staircase, just take the first step."

"I want to be extraordinary."

"Medicine is a science, not an art. There are rules."

"Change brings new opportunities."

"Every day is a new opportunity."

"Healing doesn't mean forgetting."

"You either get better or you get bitter."