“Man is free, but his freedom ceases when he has no faith in it”
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Memoirs (trans. Machen 1894), book 1, Preface http://etext.library.adelaide.edu.au/c/casanova/c33m/preface2.html
Referenced
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Giacomo Casanova 55
Italian adventurer and author from the Republic of Venice 1725–1798Related quotes

“If for harming himself a man forfeits his freedom, then he was never free in the first place.”
“Addicted to that Rush,” http://www.ilanamercer.com/phprunner/public_article_list_view.php?editid1=488 WorldNetDaily.com, March 6, 2009.
2000s, 2009

"Honest People Have Rights, Too" (8 February 1960).
Scientology Bulletins

This quotation appeared in an article by Margaret Thatcher, "The Moral Foundations of Society" ( Imprimis, March 1995 https://imprimis.hillsdale.edu/the-moral-foundations-of-society/), which was an edited version of a lecture Thatcher had given at Hillsdale College in November 1994. Here is the actual passage from Thatcher's article:
<blockquote>[M]ore than they wanted freedom, the Athenians wanted security. Yet they lost everything—security, comfort, and freedom. This was because they wanted not to give to society, but for society to give to them. The freedom they were seeking was freedom from responsibility. It is no wonder, then, that they ceased to be free. In the modern world, we should recall the Athenians' dire fate whenever we confront demands for increased state paternalism.</blockquote>
The italicized passage above originated with Thatcher. In characterizing the Athenians in the article she cited Sir Edward Gibbon, but she seems to have been paraphrasing statements in "Athens' Failure," a chapter of classicist Edith Hamilton's book The Echo of Greece (1957), pp. 47–48 http://www.ergo-sum.net/books/Hamilton_EchoOfGreece_pp.47-48.jpg).
Misattributed

“Man is fulfilled only when he ceases to be man.”
Drawn and Quartered (1983)

“When the white man turns tyrant, it is his own freedom that he destroys.”
Source: Shooting an Elephant

“Freedom is indivisible, and when one man is enslaved, all are not free.”
Source: "Ich bin ein Berliner" Speech, June 26, 1963, https://en.wikipedia.org/wiki/File:Ich_bin_ein_Berliner_Speech_(June_26,_1963)_John_Fitzgerald_Kennedy_trimmed.theora.ogv
Context: Freedom is indivisible, and when one man is enslaved, all are not free. When all are free, then we can look forward to that day when this city will be joined as one and this country and this great Continent of Europe in a peaceful and hopeful globe. When that day finally comes, as it will, the people of West Berlin can take sober satisfaction in the fact that they were in the front lines for almost two decades.

Political Science for Civil Services Main Examination (2010)