I was watching the new PBS documentary on Ford last night, and it sounds like it might have been part of his anti-Semitic ranting. On the show they mentioned the years when he bought and published The Dearborn Independent and distributed it not only by subscription but through Ford showrooms nationwide. The very first Ford-published issue began with a Hitler-worthy screed hitting all the usual charges made by those charges a Jewish conspiracy to control the world, include their alleged control of the banking system. (He also printed the "Protocols of the Elders of Zion;" he later apologized publicly, but in private continued to complain about "the Jews."
Casual Googling did not find the source for me, and only one preceding line...
It is well enough that people of the nation do not understand our banking and monetary system, for if they did, I believe there would be a revolution before tomorrow morning. The one aim of these financiers is world control by the creation of inextinguishable debt.
The quote seems to be extremely popular on conspiracy theory sites.
It could well be from The Dearborn Independent, judging from this line from
http://www.jewishvirtuallibrary.org/jsource/anti-semitism/ford1.htmla summary of what Ford published there:
]
The Independent charged that the national debt was Jewish-inspired to enslave Americans, and that German Jewish financier Paul Warburg had emigrated to America for the express purpose of changing our financial system by creating the Federal Reserve.