Trust..........................

     Since the Civil War, dollar coins in the United States have exhibited the words "In God We Trust", and the motto has appeared on dollar bills since 1957.  Trust is fundamental to the acceptability, and so the value, of money.  But it is trust not in God but in the issuer of money, usually governments, that determines its value.  And that trust has been sorely tried over the centuries.

-Mervyn King,   The End of Alchemy:  Money, Banking, and the Future of the Global Economy