In the remake of Miracle on 34th Street (the slightly schmaltzier version of the classic movie) a wave of people across New York - including a couple of baddies - sport "I believe" badges as part of the campaign to liberate Kris Kringle from the asylum.
This statement of faith - an assertion of a truth without evidence or hope of evidence - is the essence of the film. "If the government of the United States can place its trust in God without evidence," proclaims the judge, "then the State of New York can say it believes in Father Christmas."
So it is with HS2. As each economic, social and fiscal argument in its favour falls down we end up with pure faith:
The HS2 rail project would help "rebalance" the UK, former deputy prime minister Lord Heseltine has said.The senior Tory called the high-speed line a "really imaginative project" to spread the prosperity of London and south-east England around the UK.
"All over the world governments are making decisions about a future which they cannot predict but in which they believe."