The earliest known appearance of this statement is from 1895 (Joshua Douglass, "Bimetallism and Currency", American Magazine of Civics, 7:256). It is apparently a combination of paraphrases or approximate quotations from three separate letters of Jefferson (longer excerpts in sourced section):
I sincerely believe, with you, that banking institutions are more dangerous than standing armies...
Letter to John Taylor (1816)
The bank mania...is raising up a moneyed aristocracy in our country which has already set the government at defiance...
Letter to Josephus B. Stuart (1817)
Bank paper must be suppressed, and the circulating medium must be restored to the nation to whom it belongs.
Letter to John W. Eppes (1813)
Misattributed
“The bank mania is one of the most threatening of these imitations. It is raising up a moneyed aristocracy in our country which has already set the government at defiance, and although forced at length to yield a little on this first essay of their strength, their principles are unyielded and unyielding. These have taken deep root in the hearts of that class from which our legislators are drawn, and the sop to Cerberus from fable has become history. Their principles lay hold of the good, their pelf of the bad, and thus those whom the Constitution had placed as guards to its portals, are sophisticated or suborned from their duties.”
Letter to Josephus B. Stuart (May 10, 1817) ME 15:112; reported in The Writings of Thomas Jefferson, ed. Andrew A. Lipscomb (1904), vol. 15, p. 112
Posthumous publications, On financial matters
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Thomas Jefferson 456
3rd President of the United States of America 1743–1826Related quotes
to George Logan, 1816 http://memory.loc.gov/master/mss/mtj/mtj1/049/0600/0642.jpgLetter
Posthumous publications, On financial matters
Source: The Papers of Thomas Jefferson: Retirement Series, Volume 10: 1 May 1816 to 18 January 1817
" Inaugural Address http://governor.maryland.gov/2015/01/21/inaugural-address-governor-larry-hogan/" (21 January 2015)
Speech to Conservative Party Conference (20 October 1967) http://www.margaretthatcher.org/document/101586
Backbench MP
No Compromise – No Political Trading (1899)
1920s, Unveiling of Equestrian Statue of Bishop Francis Asbury, (Oct. 15, 1924)
Speech to the annual meeting of the depositors in the provident savings banks connected with the South-Eastern and Metropolitan Railway Companies in the City Terminus Hotel (18 June 1890), quoted in The Times (19 June 1890), p. 6.
1890s
Inaugural address (1837)
Interview with Lisa Owen at Newshub Nation, 21 October 2017