Who said "I have to remember why I'm doing this."?

This quote is attributed to The Flash (DCEU).

I have to remember why I'm doing this. - The Flash (DCEU)

"I have to remember why I'm doing this."

The Flash (DCEU)

"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."