“Beat the plowshares back into swords; the other was a maiden aunt’s fancy.”

Address to United Nations General Assembly http://www.reagan.utexas.edu/archives/speeches/1987/092187b.htm (21 September 1987)
1980s, Second term of office (1985–1989)
Context: Cannot swords be turned to plowshares? Can we and all nations not live in peace? In our obsession with antagonisms of the moment, we often forget how much unites all the members of humanity. Perhaps we need some outside, universal threat to make us recognize this common bond. I occasionally think how quickly our differences worldwide would vanish if we were facing an alien threat from outside this world. And yet, I ask you, is not an alien force already among us? What could be more alien to the universal aspirations of our peoples than war and the threat of war?

Source: Valiant

Hats, Hunches And Happiness (1945)

Go Rin No Sho (1645), The Ground Book
Context: To master the virtue of the long sword is to govern the world and oneself, thus the long sword is the basis of strategy. The principle is "strategy by means of the long sword". If he attains the virtue of the long sword, one man can beat ten men. Just as one man can beat ten, so a hundred men can beat a thousand, and a thousand men can beat ten thousand. In my strategy, one man is the same as ten thousand, so this strategy is the complete warrior's craft.
The Way of the warrior does not include other Ways, such as Confucianism, Buddhism, certain traditions, artistic accomplishments and dancing. But even though these are not part of the Way, if you know the Way broadly you will see it in everything. Men must polish their particular Way.

On a Dull Writer, reported in John Hawkesworth, The Works of Jonathan Swift, D.D., Dean of St. Patrick's, Dublin (1754), p. 265. Alternately attributed to Alexander Pope by Bartlett's Quotations, 10th Edition (1919). Compare: "His wit invites you by his looks to come, But when you knock, it never is at home", William Cowper, Conversation, line 303
Disputed

Credited as Epigram: An Empty House (1727), or On a Dull Writer; alternately attributed to Jonathan Swift in John Hawkesworth, The Works of Jonathan Swift, D.D., Dean of St. Patrick's, Dublin (1754), p. 265. Compare: "His wit invites you by his looks to come, But when you knock, it never is at home", William Cowper, Conversation, line 303.
Misattributed

Source: Invitation to Sociology (1963), Chapter 1

(7th September 1822) Poetical Sketches. Third series - Sketch the First. The Mine
14th September 1822) Poetical Sketches. Third series - Sketch the Second. Gladesmuir see The Improvisatrice (1824
21st September 1822) Poetical Sketches. Third series - Sketch the Third. The Minstrel of Portugal see The Improvisatrice (1824
28th September 1822) Poetical Sketches. Third series - Sketch the Fourth. The Castilian Nuptuals see The Vow of the Peacock (1835
5th October 1822) Poetical Sketches. Third series - Sketch the Fifth. The Lover's Rock see The Vow of the Peacock (1835
12th October 1822) Poetical Sketches. Third series - Sketch the Sixth. The Basque girl and Henri Quatre see The Improvisatrice (1824
The London Literary Gazette, 1821-1822

"Song. She is not fair"
Poems (1851)