Who said "Justice requires more than power; it requires heart."?

This quote is attributed to The Flash (DCEU).

Justice requires more than power; it requires heart. - The Flash (DCEU)

"Justice requires more than power; it requires heart."

The Flash (DCEU) Justice

"I'm fast. Really fast."

"Time moves differently when you're moving at super speed."

"You gotta embrace what makes you different."

"Running away isn't always the answer, even when you're fast enough to do it."

"Justice must always prevail."

"You think I'm just some animal?"

"Fighting for what's right never gets easier."

"Justice is worth fighting for."