“As a nation we must prevent hunger and cold to those of our people who are in honest difficulties.”

The Future of Civilization (1938)
Context: Unfortunately, the Manchurian crisis arose at a time when those nations who might have been expected to have perceived most clearly the necessity of preventing aggression were themselves in a condition of great internal difficulties owing to the financial crisis of those days. … And perhaps it was inevitable in such circumstances that our people should take little interest in any foreign questions.
It was partly for these reasons, no doubt, that the conquest of Manchuria and the other northern provinces of China came to be consummated, and all the ambitious statesmen of the world were given an object lesson of how, in spite of the League and in spite of the Covenant, the old military policies could be successfully carried out.
And may I venture to emphasize at this point a lesson which must never be forgotten: how much one problem in international affairs affects the whole conduct of those affairs. It was no doubt the failure of the League to check aggression in the Far East which first struck a blow at the whole system which we were trying to establish and which facilitated even greater attacks on international security.

"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 has many difficulties and democracy is not perfect, but we have never had to put a wall up to keep our people in, to prevent them from leaving us. [... ] While the wall is the most obvious and vivid demonstration of the failures of the Communist system, for all the world to see, we take no satisfaction in it, for it is, as your Mayor has said, an offense not only against history but an offense against humanity, separating families, dividing husbands and wives and brothers and sisters, and dividing a people who wish to be joined together.

Context: For many South Koreans today, the Korean War is little more than a tragedy of the past or a tale in abstraction. For others, it is a trauma best forgotten. But on Memorial Day, the South Koreans, as a nation, must not forget the suffering and sacrifice in their national historical experience. The lessons of the most traumatic past must be learned and continually relearned, not only to prevent such a tragedy from repeating itself, but also to honor, as one nation, those who made our freedom possible, and to remember that freedom is certainly never free.

Editorial (1956) on importance of preservation rather than breaches of world peace.
Saturday Review

1970s, Proclamation 4417 (1976)

Source: Never Again: Securing America and Restoring Justice (2006), p. 192

Upon assuming office as the sixth prime minister of Malaysia. <br class="br"> Quotable quotes from Najib, NST, 11 Jul 2009 http://www.nst.com.my/Current_News/NST/articles/6kon/Article/index_html,

1960s, Why I Am Opposed to the War in Vietnam (1967)

Source: The Poisonwood Bible