“However much we may sympathize with a small nation confronted by a big and powerful neighbour, we cannot in all circumstances undertake to involve the whole British Empire in war simply on her account. If we have to fight it must be on larger issues than that.”
Broadcast (27 September 1938), quoted in The Times (28 September 1938), p. 10
Prime Minister
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Neville Chamberlain 58
Former Prime Minister of the United Kingdom 1869–1940Related quotes

King Albert I of Belgium's diary entry (7 February 1916), quoted in R. van Overstraeten (ed.), The War Diaries of Albert I King of the Belgians (1954), p. 85.

Remarks by el-Sisi during a military conference (28 April 2013) http://www.youtube.com/watch?v=LC93fn9s3-c.
2013
Variant: Simply, all what we did is that we avoided the country a big crisis and a battle between Egyptians. Beware, instead of Egyptians fighting each other, no, you can fight us, and we protect all. how many would fight us? but Egyptians fighting each other would be a big war we couldn't have had the ability to deal with.

1910s, Address to Congress: Analyzing German and Austrian Peace Utterances (1918)
Context: There shall be no annexations, no contributions, no punitive damage. Peoples are not to be handed about from one sovereignty to another by an international conference or an understanding between rivals and antagonists. National aspirations must be respected; peoples may now be dominated and governed only by their own consent. "Self-determination" is not a mere phrase. It is an imperative principle of actions which statesmen will henceforth ignore at their peril. We cannot have general peace for the asking, or by the mere arrangements of a peace conference. It cannot be pieeed together out of individual understandings between powerful states. All the parties to this war must join in the settlement of every issue anywhere involved in it; beeause what we are seeing is a peace that we can all unite to guarantee and maintain and every item of it must be submitted to the common judgment whether it be right and fair, an act of justice, rather than a bargain between sovereigns.

Speech to centenary dinner of the Toronto Board of Trade (24 January 1944), quoted in The Times (25 January 1944), p. 3
Ambassador to the United States

Quoted in Lord Riddell's diary entry (13 October 1914), J. M. McEwen (ed.), The Riddell Diaries 1908-1923 (London: The Athlone Press, 1986), p. 92
Chancellor of the Exchequer

"Lord Roberts and Germany", p. 78
Unionist Policy and Other Essays (1913)

“Friendship is an arrangement by which we undertake to exchange small favors for big ones.”

In p. 139.
Quote, Thought Leaders

The Daily Chronicle on the 7 March 1917 https://www.rte.ie/centuryireland/index.php/articles/george-bernard-shaw-joyriding-on-the-front.
1910s, The Technique of War (1917)