Who said "Imagination is the only limit to what we can achieve."?

This quote is attributed to The Flash (DCEU).

Imagination is the only limit to what we can achieve. - The Flash (DCEU)

"Imagination is the only limit to what we can achieve."

The Flash (DCEU) Imagination

"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."

"Imagination is more powerful than knowledge."

"The world is full of wonders if you know where to look."

"You have the imagination of a child, Lucy"

"The world is full of mysteries waiting to be solved."