“As we all know, socialism failed. At the height of its popularity it caused widespread starvation and deprivation, wrecking whole economies wherever it was applied. It inspired childish, petulant dictators — ideologues who were eager to do anything except give up an idea that didn’t work — to put millions against the wall and send millions more to places like Siberia because the people couldn’t (the dictators said 'wouldn’t') gladly transmogrify themselves into New Collectivist Mankind, or whatever the slogan was at the time. In the end, it finally destroyed the most enormous empire history had ever known.”

Part 3, Chapter 14, Dividing the Pie, p. 168
Economics For Everyone (2008)

Source: Persepolis 2: The Story of a Return

This is also sometimes quoted as "The millions of people, armed in the holy cause of liberty".
1770s, "Give me liberty, or give me death!" (1775)
Context: They tell us, sir, that we are weak; unable to cope with so formidable an adversary. But when shall we be stronger? Will it be the next week, or the next year? Will it be when we are totally disarmed, and when a British guard shall be stationed in every house? Shall we gather strength by irresolution and inaction? Shall we acquire the means of effectual resistance by lying supinely on our backs and hugging the delusive phantom of hope, until our enemies shall have bound us hand and foot?
Sir, we are not weak if we make a proper use of those means which the God of nature hath placed in our power. Three millions of people, armed in the holy cause of Liberty, and in such a country as that which we possess, are invincible by any force which our enemy can send against us. Besides, sir, we shall not fight our battles alone. There is a just God who presides over the destinies of nations, and who will raise up friends to fight our battles for us. The battle, sir, is not to the strong alone; it is to the vigilant, the active, the brave.

Times of Israel http://www.timesofisrael.com/netanyahu-endorses-reuven-rivlin-for-president/, 28 May 2014

As quoted in "Is Putin Popular?" https://www.nationalreview.com/2018/03/is-putin-popular-c/ (2018), by Jay Nordlinger, National Review
2010s

Source: Principles of Economics (1998-), Ch. 1. Ten Principles of Economics; p. 4

Presidential campaign (April 12, 2015 – 2016), (July 28, 2016)

Preface, p. xvi
World Brain (1938)
Context: We do not want dictators, we do not want oligarchic parties or class rule, we want a widespread world intelligence conscious of itself. To work out a way to that world brain organization is therefore our primary need in this age of imperative construction.

1990s, Nobel Prize acceptance speech (1993)