Who said "Imagination is the only real limit we have."?

This quote is attributed to Stewart.

Imagination is the only real limit we have. - Stewart

"Imagination is the only real limit we have."

Stewart Imagination

"I have a feeling something bad is going to happen."

"Um, excuse me, but I think you're being very immature."

"This sucks. This sucks ass."

"You guys are being really mean."

"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."