A Quote by Lewis Carroll on madness, insanity, collective unconscious, and place

'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 Carroll (1832 - 1898)

Source: Alice's Adventures in Wonderland and Through the Looking Glass, Pages: Chapter 6

Contributed by: Tsuya