Who said "Death taught me to live like every moment counts."?

This quote is attributed to The Flash (DCEU).

Death taught me to live like every moment counts. - The Flash (DCEU)

"Death taught me to live like every moment counts."

The Flash (DCEU) Death

"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."

"Death doesn't scare me anymore."

"Death and I are old friends."

"Welcome to my world."

"Death is just the beginning."