“We cannot forget what had happened and history should not repeat itself.”
As quoted in Pioneers of Modern China : Understanding the Inscrutable Chinese (2005) by Khoon Choy Lee
Context: Nobody would say the cowshed was heaven and nobody would say the inhuman torture of so many victims be called a revolution of the proletariat. … A museum should be established to remind China of the follies and disasters that had fallen from 1966 to 1976. We cannot forget what had happened and history should not repeat itself.
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Ba Jin 36
Chinese novelist 1904–2005Related quotes
“History repeats itself: historians repeat each other.”
" Some Historians http://books.google.com/books?id=E0luAAAAMAAJ&q=%22History+repeats+itself+historians+repeat+each+other%22&pg=PA20#v=onepage," Supers & Supermen: Studies in Politics, History and Letters (1920)

“History repeats itself. That's one of the things wrong with history.”
As quoted in Peter's Quotations: Ideas For Our Time (1977) edited by Laurence J. Peter, p. 248

“History doesn't repeat itself, but it does rhyme.”
Origins unclear. Earliest known match in print comes from 1970, in a collection called “Neo Poems” by Canadian artist John Robert Colombo, who recalled reading it sometime in the 1960s. Twain did say "History never repeats itself, but the Kaleidoscopic combinations of the pictured present often seem to be constructed out of the broken fragments of antique legends." in the 1874 edition of “The Gilded Age: A Tale of To-Day”. A thematic precursor, "History May Not Repeat, But It Looks Alike", appears in a 1941 article by Chicago Tribune in Illinois. (Source: Quote Investigator https://quoteinvestigator.com/2014/01/12/history-rhymes/)
Misattributed
On not tossing certain facets of African American culture as relics in “AN INTERVIEW WITH AMERICAN PLAYWRIGHT AUGUST WILSON” https://kuscholarworks.ku.edu/bitstream/handle/1808/25048/Tibbetts_AugustWIlson_2002.pdf?sequence=4&isAllowed=y (John C. Tibbetts, 2002)

“It is the soothing thing about history that it does repeat itself.”
Wars I Have Seen (1945)

“History repeats itself all the time on Wall Street.”
Source: Reminiscences of a Stock Operator (1923), Chapter XVIII, p. 217

“Those who cannot learn from history are doomed to repeat it.”