“Yes, hope is a strange thing. Peace at last. But at what price?”

Address to the United Nations (1963)
Context: Twenty-seven years ago, as Emperor of Ethiopia, I mounted the rostrum in Geneva, Switzerland, to address the League of Nations and to appeal for relief from the destruction which had been unleashed against my defenceless nation, by the Fascist invader.
I spoke then both to and for the conscience of the world. My words went unheeded, but history testifies to the accuracy of the warning that I gave in 1936. Today, I stand before the world organization which has succeeded to the mantle discarded by its discredited predecessor. In this body is enshrined the principle of collective security which I unsuccessfully invoked at Geneva. Here, in this Assembly, reposes the best — perhaps the last — hope for the peaceful survival of mankind.

Hays translation
Source: Meditations (c. AD 121–180), Book IX, 42

Source: On the Road

Poetry written around the time of the breaking of her "tenuous engagement" to Samuel Chapman (c. 1928), published in Amelia, My Courageous Sister : Biography of Amelia Earhart (1987) by Muriel Earhart Morrissey and Carol L. Osborne, p. 74; also in Amelia : A Life of the Aviation Legend (1999) by Donald M. Goldstein and Katherine V. Dillon, p. 38
Context: Courage is the price that
Life exacts for granting peace.
The soul that knows it not, knows no release
From little things:
Knows not the livid loneliness of fear,
Nor mountain heights where bitter joy can hear
The sound of wings.

In response to the question: The Kremlin says it just charges market prices.
"Q&A: Putin's Critical Adviser," 2005

Letter to S. Stanwood Menken, chairman, committee on Congress of Constructive Patriotism (January 10, 1917). Roosevelt’s sister, Mrs. Douglas Robinson, read the letter to a national meeting, January 26, 1917. Reported in Proceedings of the Congress of Constructive Patriotism, Washington, D.C., January 25–27, 1917 (1917), p. 172
1910s
Context: Americanism means the virtues of courage, honor, justice, truth, sincerity, and hardihood—the virtues that made America. The things that will destroy America are prosperity-at-any-price, peace-at-any-price, safety-first instead of duty-first, the love of soft living and the get-rich-quick theory of life.

This has been attributed to Marshall, and he might have used the phrase, but earlier uses exist:
There is an imperialism that deserves all honor and respect — an imperialism of service in the discharge of great duties. But with too many it is the sense of domination and aggrandisement, the glorification of power. The price of peace is eternal vigilance.
Leonard H. Courtney as quoted in The Life Of Lord Courtney (I920) by G. P. Gooch
Courtney's statement however is probably derived from an earlier statement with several variants:
The price of freedom is eternal vigilance.
The price of liberty is eternal vigilance.
Eternal vigilance is the price of liberty.
These have often been attributed to Thomas Jefferson, but also Thomas Paine, Abraham Lincoln, and many others; Alfred Denning in The Road to Justice (1988) states that the phrase originated in a statement of Irish orator John Philpot Curran in 1790: "It is the common fate of the indolent to see their rights become a prey to the active. The condition upon which God hath given liberty to man is eternal vigilance."
Misattributed

Source: The Coldest Girl in Coldtown