He wanted to say all this, and couldn't. For a man with an itch to see the whole of infinity, Twoflower never… — Terry Pratchett

He wanted to say all this, and couldn't. For a man with an itch to see the whole of infinity, Twoflower never actually moved outside his own head. Telling him the truth would be like kicking a spaniel.

Source: Wikiquote · CC BY-SA 4.0