“We must plan for freedom, and not only for security, if for no other reason than that only freedom can make security secure.”

A Fresh Look at Empiricism: 1927-42 (1996), p. 443
Attributed from posthumous publications

Source: Give Me Liberty! (1998), Ch. 16 : Security, the One-Way Ticket to Slavery, p. 174

The Crime Against Kansas speech (May 19-20, 1856)

Source: Freedom, Loyalty, Dissent (1954), pp. vii - viii

2000, Reaction to calls from Australian Foreign Minister Alexander Downer for the Military to stay out of politics (30 September 2005)

Listen, Little Man! (1948)
Context: You beg for happiness in life, but security is more important to you, even if it costs you your spine or your life. Your life will be good and secure when aliveness will mean more to you than security; love more than money; your freedom more than party line or public opinion; when your thinking will be in harmony with your feelings; when the teachers of your children will be better paid than the politicians; when you will have more respect for the love between man and woman than for a marriage license.

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

1940s, State of the Union Address — The Four Freedoms (1941)
Context: In the future days which we seek to make secure, we look forward to a world founded upon four essential human freedoms.
The first is freedom of speech and expression — everywhere in the world.
The second is freedom of every person to worship God in his own way — everywhere in the world.
The third is freedom from want, which, translated into world terms, means economic understandings which will secure to every nation a healthy peacetime life for its inhabitants — everywhere in the world.
The fourth is freedom from fear, which, translated into world terms, means a world-wide reduction of armaments to such a point and in such a thorough fashion that no nation will be in a position to commit an act of physical aggression against any neighbor — anywhere in the world.
That is no vision of a distant millennium. It is a definite basis for a kind of world attainable in our own time and generation.

Imprimis, "The Moral Foundations of Society" (March 1995), http://imprimisarchives.hillsdale.edu/file/archives/pdf/1995_03_Imprimis.pdf an edited version of a lecture Thatcher had delivered at Hillsdale College in November 1994. In characterizing the Athenians Thatcher was paraphrasing from "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 but in her lecture Thatcher mistakenly attributed the opinions to Edward Gibbon. Subsequently, a version of this quotation has been widely circulated on the Internet, misattributed to Gibbon.
In a later address, "The Moral Foundation of Democracy," https://www.youtube.com/watch?v=bb1sgMoYb70 given in April 1996 at a Clearwater, Florida gathering of the James Madison Institute, Thatcher delivered the same sentiment in a slightly different way: " 'In the end, more than they wanted freedom, [the Athenians] wanted security. They wanted a comfortable life. But they lost it all—security, comfort, and freedom. … When the Athenians finally wanted not to give to society, but for society to give to them, when the freedom they wished for most was freedom from responsibility, then Athens ceased to be free.' There you have the germ of the dependency culture: freedom from responsibility."
Post-Prime Ministerial