Who said "Fear taught me more than confidence ever could."?

This quote is attributed to Nebula.

Fear taught me more than confidence ever could. - Nebula

"Fear taught me more than confidence ever could."

Nebula Fear

"I didn't ask for this life."

"You're welcome."

"I will kill you slowly."

"Gamora may have stolen your money, but I will steal your life."

"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."