Who said "I must be strong. I must be fast. I must be merciless."?

This quote is attributed to Bruce Wayne.

I must be strong. I must be fast. I must be merciless. - Bruce Wayne

"I must be strong. I must be fast. I must be merciless."

Bruce Wayne Strength

"It's not who I am underneath, but what I do that defines me."

"Fear is a tool. When that light hits the sky, it's not just a signal. It's a warning."

"I'm whatever Gotham needs me to be."

"The mask isn't just for concealing who I am. It's for revealing the truth about who I need to be."

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."