“I am certain that a solution of the general problem of peace must rest on broad and basic understanding on the part of its peoples. Great single endeavors like a League of Nations, a United Nations, and undertakings of that character, are of great importance and in fact absolutely necessary, but they must be treated as steps toward the desired end.”

1930s, Quarantine Speech (1937)
Context: If civilization is to survive, the principles of the Prince of Peace must be restored. Shattered trust between nations must be revived. Most important of all, the will for peace on the part of peace-loving nations must express itself to the end that nations that may be tempted to violate their agreements and the rights of others will desist from such a cause. There must be positive endeavors to preserve peace. America hates war. America hopes for peace. Therefore, America actively engages in the search for peace.

Some Reflections on Peace in Our Time (1950)
Context: There can be peace and a better life for all men. Given adequate authority and support, the United Nations can ensure this. But the decision really rests with the peoples of the world. The United Nations belongs to the people, but it is not yet as close to them, as much a part of their conscious interest, as it must come to be. The United Nations must always be on the people's side. Where their fundamental rights and interests are involved, it must never act from mere expediency. At times, perhaps, it has done so, but never to its own advantage nor to that of the sacred causes of peace and freedom. If the peoples of the world are strong in their resolve and if they speak through the United Nations, they need never be confronted with the tragic alternatives of war or dishonourable appeasement, death, or enslavement.

Address to the German Reichstag (15 October 1928), quoted in The Times (16 October 1928), p. 15
1920s

Official statement as Minister of the Blockade (31 August 1917)
Context: The great difficulty of all schemes for leagues of nations and the like has been to find an effective sanction against nations determined to break the peace.
I will not now discuss at length the difficulties of joint armed action, but every one who has studied the question knows they are very great. It may be, however, that a league of nations, properly furnished with machinery to enforce the financial, commercial, and economic isolation of any nation determined to force its will upon the world by mere violence, would be a real safeguard for the peace of the world. In any case that is a subject that may well be studied by those sincerely anxious to put an end to the present system of International anarchy.

Speech to the Labour Party Conference in Caxton Hall, London (12 December 1944), quoted in The Times (13 December 1944), p. 2.
War Cabinet

1900s, Inaugural Address (1905)

Context: The early years of the United Nations have been difficult ones, but what did we expect? That peace would drift down from the skies like soft snow? That there would be no ordeal, no anguish, no testing, in this greatest of all human undertakings?
Any great institution or idea must suffer its pains of birth and growth. We will not lose faith in the United Nations. We see it as a living thing and we will work and pray for its full growth and development. We want it to become what it was intended to be — a world society of nations under law, not merely law backed by force, but law backed by justice and popular consent.

Speech in Springfield Illinois (24 October 1952)

Essentials to Peace (1953)
Context: I believe our students must first seek to understand the conditions, as far as possible without national prejudices, which have led to past tragedies and should strive to determine the great fundamentals which must govern a peaceful progression toward a constantly higher level of civilization. There are innumerable instructive lessons out of the past, but all too frequently their presentation is highly colored or distorted in the effort to present a favorable national point of view. In our school histories at home, certainly in years past, those written in the North present a strikingly different picture of our Civil War from those written in the South. In some portions it is hard to realize they are dealing with the same war. Such reactions are all too common in matters of peace and security. But we are told that we live in a highly scientific age. Now the progress of science depends on facts and not fancies or prejudice. Maybe in this age we can find a way of facing the facts and discounting the distorted records of the past.

Some Reflections on Peace in Our Time (1950)