“May the men who hold the destiny of peoples in their hands, studiously avoid anything that might cause the present situation to deteriorate and become even more dangerous. May they take to heart the words of the Apostle Paul: "If it be possible, as much as lieth in you, live peaceably with all men." These words are valid not only for individuals, but for nations as well. May these nations, in their efforts to maintain peace, do their utmost to give the spirit time to grow and to act.”

1790s, Farewell Address (1796)

The Bohemian Review, Volume 1, p.5
Address of Bohemian Authors to the Parliamentary Representatives of the Bohemian People (Manifesto of Czech writers)

Letter to http://memory.loc.gov/cgi-bin/query/r?ammem/mtj:@field(DOCID+@lit(tj110158)) Thomas Leiper (12 June 1815). Published in The Works of Thomas Jefferson in Twelve Volumes http://oll.libertyfund.org/ToC/0054.php, Federal Edition, Paul Leicester Ford, ed., New York: G. P. Putnam's Sons, 1904, Vol. 11 http://oll.libertyfund.org/Texts/Jefferson0136/Works/0054-11_Bk.pdf, pp. 477–478.
The sentence "I hope our wisdom will grow with our power, and teach us, that the less we use our power, the greater it will be." was used by US-President Barack Obama in his A New Beginning Speech.
1810s
Context: We concur in considering the government of England as totally without morality, insolent beyond bearing, inflated with vanity and ambition, aiming at the exclusive dominion of the sea, lost in corruption, of deep-rooted hatred towards us, hostile to liberty wherever it endeavors to show its head, and the eternal disturber of the peace of the world. In our estimate of Bonaparte, I suspect we differ. [... ] Our form of government is odious to him, as a standing contrast between republican and despotic rule; and as much from that hatred, as from ignorance in political economy, he had excluded intercourse between us and his people, by prohibiting the only articles they wanted from us, that is, cotton and tobacco. Whether the war we have had with England, and the achievements of that war, and the hope that we may become his instruments and partisans against that enemy, may induce him, in future, to tolerate our commercial intercourse with his people, is still to be seen. For my part, I wish that all nations may recover and retain their independence; that those which are overgrown may not advance beyond safe measures of power, that a salutary balance may be ever maintained among nations, and that our peace, commerce, and friendship, may be sought and cultivated by all. It is our business to manufacture for ourselves whatever we can, to keep our markets open for what we can spare or want; and the less we have to do with the amities or enmities of Europe, the better. Not in our day, but at no distant one, we may shake a rod over the heads of all, which may make the stoutest of them tremble. But I hope our wisdom will grow with our power, and teach us, that the less we use our power, the greater it will be.

1950s, Second Inaugural Address (1957)

As quoted in Global History, Volume Two : The Industrial Revolution to the Age of Globalization (2008) by Jerry Weiner, Mark Willner, George A. Hero and Bonnie-Anne Briggs, p. 175
Context: Mexicans: let us now pledge all our efforts to obtain and consolidate the benefits of peace. Under its auspices, the protection of the laws and of the authorities will be sufficient for all the inhabitants of the Republic. May the people and the government respect the rights of all. Between individuals, as between nations, peace means respect for the rights of others.

The historical extempore speech at the Reserve Officers' College (1959)

1963, Ich bin ein Berliner
Context: Freedom is indivisible, and when one man is enslaved, all are not free. When all are free, then we can look forward to that day when this city will be joined as one and this country and this great Continent of Europe in a peaceful and hopeful globe. When that day finally comes, as it will, the people of West Berlin can take sober satisfaction in the fact that they were in the front lines for almost two decades.
All free men, wherever they may live, are citizens of Berlin, and, therefore, as a free man, I take pride in the words "Ich bin ein Berliner."

The Foundations of the Nineteenth Century (Die Grundlagen des neunzehnten Jahrhunderts) (1899)

Introductory Chapter. Variant: This, therefore, is a faded dream of the time when I went down into the dust and noise of the Eastern market-place, and with my brain and muscles, with sweat and constant thinking, made others see my visions coming true. Those who dream by night in the dusty recesses of their minds wake in the day to find that all was vanity; but the dreamers of the day are dangerous men, for they may act their dream with open eyes, and make it possible.
Seven Pillars of Wisdom (1922)