Quotes about strength
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Source: True Grit (1968), Chapter 6, p. 167 : thoughts of 'Mattie Ross'

“I hate men who are afraid of women's strength.”
Source: Henry and June: From "A Journal of Love"--The Unexpurgated Diary of Anaïs Nin

Source: Traveling Light: Releasing the Burdens You Were Never Intended to Bear

Lonesome Traveler (1960)
Context: No man should go through life without once experiencing healthy, even bored solitude in the wilderness, finding himself depending solely on himself and thereby learning his true and hidden strength. Learning for instance, to eat when he's hungry and sleep when he's sleepy.

“What has no shadow has no strength to live.”

“My strength returns to me with my cup of coffee and the reading of the psalms.”

“God, grant me strength to accept those things I cannot change.”
Source: Angels & Demons
“Sometimes its not the strength but gentleness that cracks the hardest shells.”
Source: Lost December

“Aging is not 'lost youth' but a new stage of opportunity and strength.”

Source: Cannibales

“For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack.”
The Law of the Jungle, Stanzas 1 and 2.
The Second Jungle Book (1895)
Source: The Jungle Book
Context: p>Now this is the Law of the Jungle—as old and as true as the sky;
And the Wolf that shall keep it may prosper, but the Wolf that shall break it must die.As the creeper that girdles the tree trunk, the Law runneth forward and back;
For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack.</p

Source: Hope for Each Day: Words of Wisdom and Faith
“You can't retire to weakness -- you've got to learn to control strength.”
Source: Angle of Repose

“Pain and suffering are the soil of strength and courage.”
Source: Someone Dies, Someone Lives

“The great strength of the totalitarian state is that it forces those who fear it to imitate it.”

“Sometimes the strength of motherhood is greater than natural laws.”
Source: Homeland and Other Stories

“There are two ways of exerting one's strength: one is pushing down, the other is pulling up.”
As quoted in The Great Quotations (1971) edited by George Seldes, p. 366

“Continuous effort - not strength or intelligence - is the key to unlocking our potential.”
First mentioned as "Continuous effort — not strength or intelligence — is the key to unlocking and using our potential." according to Quote Investigator in the 1981 book The Reflecting Pond: Meditations for Self-Discovery by Liane Cordes, Quote Page 89, Hazelden Publishing, Center City, Minnesota. For further research on this quote see: Quote Investigator (August 31, 2013): Continuous Effort — Not Strength or Intelligence — Is the Key to Unlocking and Using Our Potential Winston Churchill? Liane Cordes? Liane Cardes? Apocryphal? Archived http://archive.is/E0M12 on June 2, 2020.
Source: https://quoteinvestigator.com/2013/08/21/effort/ from the original

“We work to eat to get the strength to work to eat to get the strength to work.”
To the ancients the hearth was sacred; beside the hearth they erected their lares and household-gods. Let us also hold the hearth sacred, where the conscientious German housewife slowly sacrifices her life, to keep the home comfortable, the table well supplied, and the family healthy."
"von Gerhardt, using the pen-name Gerhard von Amyntor in", A Commentary to the Book of Life. Quote taken from August Bebel, Woman and Socialism, Chapter X. Marriage as a Means of Support.

Khwaja Mas'ud bin Sa'd bin Salman:Diwan-i-Salman in Elliot and Dowson, History of India as told by its own Historians, Vol. IV, pp. 518 ff.

Letter to the central committee of the CPSU (Communist Party of Soviet Union) https://varjag2007su.livejournal.com/2591915.html?utm_source=fbsharing&utm_medium=social (20 October 1970).

The London Literary Gazette (24th January 1835) Versions from the German (Fourth Series.) 'The Empire of Woman' — Schiller.
Translations, From the German

Will China Rule the World? http://www.project-syndicate.org/commentary/rodrik39

1920s, Authority and Religious Liberty (1924)
“Commerce and Culture,” p. 280.
Giants and Dwarfs (1990)

1962, Address at Independence Hall

Ibid.
"The Ends of Zionism: Racism and the Palestinian Struggle"

Source: Ode on the Pleasure Arising from Vicissitude http://www.thomasgray.org/cgi-bin/display.cgi?text=oopv (1754), Line 35

Speech proclaiming the termination of the state of Martial law, Heroes Hall, Malacañang (17 January 1981)
1965

“God give me strength to face a fact though it slay me.”
As quoted in Nature Vol. 149 (Jan-Jun) 1942 p. 291, and A Philosophy for Our Time (1954) by Bernard Mannes Baruch, p. 13
1890s

“James Wilks,” interview with Great Vegan Athletes (2013) http://www.greatveganathletes.com/content/james-wilks.
Source: A Theory of Justice (1971; 1975; 1999), p. 117

Source: The Modern Rack (1889), Ch. I: The Moral Aspects of Vivisection, p. 15

"Discovering Veganism", in heathermills.org (2016) http://www.heathermills.org/veganism/

Un Art de Vivre (The Art of Living) (1939), The Art of Growing Old

Speech in the House of Commons (26 February 1810), quoted in George Henry Francis, Opinions and Policy of the Right Honourable Viscount Palmerston, G.C.B., M.P., &c. as Minister, Diplomatist, and Statesman, During More Than Forty Years of Public Life (London: Colburn and Co., 1852), pp. 3-4.
1810s

Letter to J. Edward Austen (1817-05-27) [Jane Austen, Her Life and Letters: A Family Record]
Letters

"Einstein and the Search for Unification", p. 11 https://books.google.com/books?id=rEaUIxukvy4C&pg=PA11, in The legacy of Albert Einstein: a collection of essays in celebration of the year of physics (2007)
As quoted in Lies My Teacher Told Me: Everything Your American History Textbook Got Wrong https://books.google.com/books?id=5m23RrMeLt4C&pg=PT225&dq=%22Twenty+Nigger+Law%22+loewen&hl=en&sa=X&ved=0ahUKEwitwZHxq7fKAhXFdR4KHVgMDrYQ6AEIHzAA#v=onepage&q=%22Twenty%20Nigger%20Law%22%20loewen&f=false (2007), New York: New Press, pp. 225–226
2000s, 2007, Lies My Teacher Told Me: Everything Your American History Textbook Got Wrong (2007)

“A Soldier should never have to hide their family. The strength of our Soldiers is our families.”
Army Times, September 2, 2012.

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 246.

Speech http://hansard.millbanksystems.com/commons/1813/mar/01/mr-grattans-motion-for-a-committee-on in the House of Commons in favour of Catholic Emancipation (1 March 1813).
1810s

From Listy do Władysława Laskowicza (Letters to Władysław Laskowicz), Warsaw, Pax, 1976.

Source: Selected Essays (1904), "Priest and Prophet" (1893), pp. 131-132

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 446.

Opening address to the Commonwealth Parliamentary Association conference in Nadi, 6 September 2005.

1960s, October surprise speech (1968)

said in an interview quoted by Javier C. Hernandez of The New York Times http://www.nytimes.com/2013/10/14/nyregion/from-his-fathers-decline-de-blasio-learned-what-not-to-do.html.