Who said "You can't help people if you don't know what you're doing."?

This quote is attributed to Cristina Yang.

You can't help people if you don't know what you're doing. - Cristina Yang

"You can't help people if you don't know what you're doing."

Cristina Yang Knowledge

"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."

"We're not just after treasure. We're preserving history."

"The mind is humanity's greatest tool."

"A tidy room reflects a tidy mind."

"You can learn a lot about a person by how they keep their space."