I don’t know and you must be mad…

Two quotes from Alice in Wonderland:

Alice came to a fork in the road. “Which road do I take?” she asked.
“Where do you want to go?” responded the Cheshire cat.
“I don’t know,” Alice answered.
“Then,” said the cat, “it doesn’t matter.”
– Lewis Carroll,  Alice In Wonderland

and

‘But I don’t want to go among mad people,’ Alice remarked.

‘Oh, you can’t help that,’ said the Cat. ‘We’re all mad here. I’m mad. You’re mad.’
‘How do you know I’m mad?’ said Alice.
‘You must be,” said the Cat. ‘or you wouldn’t have come here.’ — Lewis Carrol, Alice in Wonderland