“This complex multiform aggression is carried out with total impunity and in clear violation of the Charter of the United Nations, which expressly outlaws the threat or use of force, among other principles… for the sake of peace and the friendly relations between the Nations….”

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.

General Colin Powell, 21 April 1993, receiving the UN-USA Global Leadership Award.
1990s

in Indonesia, Palestine, and Kashmir - has demonstrated convincingly that parties to the most severe conflict may be induced to abandon war as the method of settlement in favour of mediation and conciliation, at a merciful saving of untold lives and acute suffering. Unfortunately, there may yet be some in the world who have not learned that today war can settle nothing, that aggressive force can never be enough, nor will it be tolerated. If this should be so, the pitiless wrath of the organized world must fall upon those who would endanger the peace for selfish ends. For in this advanced day, there is no excuse, no justification, for nations resorting to force except to repel armed attack.
Some Reflections on Peace in Our Time (1950)

An American Peace Policy (1925)

Address to the United Nations (1963)
Context: The Charter of the United Nations expresses the noblest aspirations of man: abjugation of force in the settlement of disputes between states; the assurance of human rights and fundamental freedoms for all without distinction as to race, sex, language or religion; the safeguarding of international peace and security.
But these, too, as were the phrases of the Covenant, are only words; their value depends wholly on our will to observe and honour them and give them content and meaning. The preservation of peace and the guaranteeing of man's basic freedoms and rights require courage and eternal vigilance: courage to speak and act — and if necessary, to suffer and die — for truth and justice; eternal vigilance, that the least transgression of international morality shall not go undetected and unremedied.
These lessons must be learned anew by each succeeding generation, and that generation is fortunate indeed which learns from other than its own bitter experience. This Organization and each of its members bear a crushing and awesome responsibility: to absorb the wisdom of history and to apply it to the problems of the present, in order that future generations may be born, and live, and die, in peace.

As quoted in The Tyrants : 2500 Years of Absolute Power and Corruption (2006) by Clive Foss, p. 143, ISBN 1905204965

Special Message to the Congress on the Threat to the Freedom of Europe (1948)

Speech to a joint session of the Dail and the Seanad, Dublin, Ireland (28 June 1963)
1963

2010s, Democracy Now! interview (2011)