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

This quote is attributed to Ali G.

Imagination is the only limit to what you can achieve - Ali G

"Imagination is the only limit to what you can achieve"

Ali G Imagination

"Booyakasha! That's what I'm talking about, innit."

"Respect to the ladies, you get me?"

"I'm 'aving a laugh, I am."

"Safe, blud. Safe."

"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."