Quotation from: The People of the Abyss

Written by: Jack London

CHAPTER I--THE DESCENT

"But you can't do it, you know," friends said, to whom I applied for
assistance in the matter of sinking myself down into the East End of
London. "You had better see the police for a guide," they added, on
second thought, painfully endeavouring to adjust themselves to the
psychological processes of a madman who had come to them with better
credentials than brains.