Who said "Courage is not the absence of fear; it is mastery of it."?

This quote is attributed to Elektra.

Courage is not the absence of fear; it is mastery of it. - Elektra

"Courage is not the absence of fear; it is mastery of it."

Elektra Courage

"I am the hand that strikes in the darkness."

"Mercy is a luxury we cannot afford."

"I've learned that attachment is a weakness."

"The world is not black and white—it is red."

"Never let fear stop you from chasing your dreams."

"Courage is being afraid but doing it anyway."

"Sometimes you gotta do what you gotta do."

"Sometimes you have to be the monster to stop the monsters."