Who said "There are other worlds than these."?

This quote is attributed to Arthur Dent.

There are other worlds than these. - Arthur Dent

"There are other worlds than these."

Arthur Dent Imagination

Character in The Hitchhiker's Guide to the Galaxy

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"This must be Thursday. I never could get the hang of Thursdays."

"Would it save you a lot of time if I just gave up and went mad now?"

"Nobody needs to know that we're here."

"You know how it is with writing. You just 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."