Quotes about the truth
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Drunk, written with Jake Gosling.
Song lyrics, + (2011)

“In either case the orator should bear clearly in mind throughout his whole speech what the fiction is to which he has committed himself, since we are apt to forget our falsehoods, and there is no doubt about the truth of the proverb that a liar should have a good memory.”
Vtrubique autem orator meminisse debebit actione tota quid finxerit, quoniam solent excidere quae falsa sunt: verumque est illud quod vulgo dicitur, mendacem memorem esse oportere.
Book IV, Chapter II, 91; translation by H. E. Butler
Compare: "Liars ought to have good memories", Algernon Sidney, Discourses on Government, chapter ii, section xv.
Alternate translation for "solent excidere quae falsa sunt": False things tend to be forgotten
De Institutione Oratoria (c. 95 AD)


Evangelicæ Historiæ: Quadripartita Monas Sive Harmonia Quatuor Evangelistarum ("Harmonization of the Gospels") (1592), dedicatory letter. Quoted in Jean Van Raemdonck, Gerard Mercator: sa vie et ses oeuvres (1869), p. 25, footnote 2 http://books.google.com/books?id=18NNAAAAcAAJ&pg=PA25

"Bickley: Tyrann Mathieu planning to soar again in 2016", The Arizona Republic (11 Apr 2016) https://eu.azcentral.com/story/sports/nfl/cardinals/2016/04/09/bickley-tyrann-mathieu-planning-soar-again-2016/82842236/.

2011, UN speech to General Assembly (September 2011)

Other

“Truth," it has been said, "is the first casualty of war.”
Introduction to Truth and the War, by E. D. Morel. London, July 1916. p. ix books.google http://books.google.de/books?id=gQFIAAAAIAAJ&q=casualty. p. xiii in the 3rd edition 1918 archive.org http://www.archive.org/stream/truthwar00more#page/n17/mode/2up (cf. Aeschylus#Misattributed)
Hiram Johnson is often credited with this statement, or something similar. However, Snowden's use appears to have predated those of Johnson while being more consistent with the now-common, "Truth is the first casualty of war."

The Poetic Principle (1850)

Interview with Glenn Greenwald, 6 June 2013, Part 1

“Truth becomes fiction when the fiction's true;
Real becomes not-real when the unreal's real.”
Jia zuo zhen shi zhen yi jia,
Wu wei you chu you huan wu.
Source: Dream of the Red Chamber (c. 1760), Chapter 5

“Deconstruction… insists not that truth is illusory but that it is institutional.”
Frère Jacques: The Politics of Deconstruction, ch. 6, Against the Grain (1984)
1980s

Other

Text of a letter written following his Hajj (1964)

I, xviii, 37. Modern translation by J.H. Taylor
De Genesi ad Litteram

Source: Referring to Frederick Temple, letter to Queen Victoria (4 November 1868), cited in The Letters of Queen Victoria, 2nd series) (1926), ed. George Earle Buckle, p. 550.

“From shadows and symbols into the truth!”
Ex umbris et imaginibus in veritatem!
His own epitaph at Edgbaston

Die einfachste und bekannteste Wahrheit erscheint uns augenblicklich neu und wunderbar, sobald wir sie zum ersten Mal an uns selbst erleben.
Source: Aphorisms (1880/1893), p. 20.

Source: The Subtle Art of Not Giving a F*ck (2016), Chapter 6, “You’re Wrong About Everything (But So Am I)” (p. 117)
[Asiri 1950, No. 126] Asiri 1950 — Asiri, Fazl Mahmud. Rubaiyat-i-Sarmad. Shantiniketan, 1950. Quoted from SARMAD: LIFE AND DEATH OF A SUFI https://iphras.ru/uplfile/smirnov/ishraq/3/24_prig.pdf by N. Prigarina

1850s, Speech at Lewistown, Illinois (1858)

“Impossible to accede to truth by opinions, for each opinion is only a mad perspective of reality.”
Drawn and Quartered (1983)
Theatrum Chemicum Volume 1 phil. med.

The Historian's Craft, pg.43

“Hate your enemies
Save your friends
Find your place
Speak the truth.”
Radio Friendly Unit Shifter.
Song lyrics, In Utero (1993)

1860s, "If Slavery Is Not Wrong, Nothing Is Wrong" (1864)

Letter to Gilbert Murray, April 3, 1902
1900s

An Acre of Grass http://poetry.poetryx.com/poems/1438/, st. 2
Last Poems (1936-1939)

Falsch am Positivismus ist, daß er die nun einmal gegebene Arbeitsteilung, die der Wissenschaften von der gesellschaftlichen Praxis und die innerhalb der Wissenschaft, als Maß des Wahren supponiert und keine Theorie erlaubt, welche die Arbeitsteilung selbst als abgeleitet, vermittelt durchsichtig machen, ihrer falschen Autorität entkleiden könnte.
Source: Wozu noch Philosophie? [Why still philosophy?] (1963), p. 10

Source: Culture and Value (1980), p. 41e

“The only people who don't want to disclose the truth are people with something to hide.”
Weekly Address https://www.whitehouse.gov/the-press-office/2010/08/21/weekly-address-president-obama-challenges-politicians-benefiting-citizen (21 August 2010)
2010

“The truth is like a lion. You don’t have to defend it. Let it loose and it will defend itself.”
Not found in Augustine's works, it is stated in Fauxtations: Because sometimes the Internet is wrong : St. Augustine: The Truth is Like a Lion (18 October 2015) https://fauxtations.wordpress.com/2015/10/18/st-augustine-the-truth-is-like-a-lion/, that this is very likely a summary derived from statements of Charles Haddon Spurgeon about the "Word of God" or "the pure gospel", and the Bible:
:: The Word of God can take care of itself, and will do so if we preach it, and cease defending it. See you that lion. They have caged him for his preservation; shut him up behind iron bars to secure him from his foes! See how a band of armed men have gathered together to protect the lion. What a clatter they make with their swords and spears! These mighty men are intent upon defending a lion. O fools, and slow of heart! Open that door! Let the lord of the forest come forth free. Who will dare to encounter him? What does he want with your guardian care? Let the pure gospel go forth in all its lion-like majesty, and it will soon clear its own way and ease itself of its adversaries.
::* The Lover of God’s Law Filled with Peace (January 1888)
: and the earlier:
:: There seems to me to have been twice as much done in some ages in defending the Bible as in expounding it, but if the whole of our strength shall henceforth go to the exposition and spreading of it, we may leave it pretty much to defend itself. I do not know whether you see that lion — it is very distinctly before my eyes; a number of persons advance to attack him, while a host of us would defend the grand old monarch, the British Lion, with all our strength. Many suggestions are made and much advice is offered. This weapon is recommended, and the other. Pardon me if I offer a quiet suggestion. Open the door and let the lion out; he will take care of himself. Why, they are gone! He no sooner goes forth in his strength than his assailants flee. The way to meet infidelity is to spread the Bible. The answer to every objection against the Bible is the Bible.
::* Speech at the Annual Meeting of the British and Foreign Bible Society "The Bible" (5 May 1875), in Speeches by C. H. Spurgeon at Home and Abroad (1878) edited by G.H. Pike https://books.google.com/books?id=j_0CAAAAQAAJ&pg=PA17&lpg=PA17#v=onepage&q&f=false
Misattributed

“Man can embody truth but he cannot know it.”
Letter to Lady Elizabeth Pelham (4 January 1939))

Justice in War-Time (1916), p. 27
1910s

“To what extent can truth endure incorporation? That is the question; that is the experiment.”
Sec. 110
The Gay Science (1882)

Mises' letter to Ayn Rand praising Atlas Shrugged,(23 January 1958), quoted in Mises: The Last Knight of Liberalism (2007).
“In an aphorism, aptness counts for more than truth.”
City Aphorisms, Fourth Selection (1987)

Letter to Lord Gladwyn, November 14, 1964.There is an artist imprisoned in each one of us. Let him loose to spread joy everywhere.
1960s

Source: 1940s, A History of Western Philosophy (1945), Chapter XXXI "The Philosophy of Logical Analysis"

Speech after the London Bridge attack (4 June 2017)

Joe Rogan Experience #958 – Jordan Peterson http://www.youtube.com/watch?v=USg3NR76XpQ&t=90m10s
Other

“Truth is the most valuable thing we have. Let us economize it.”
Pudd'nhead Wilson's New Calendar, Ch. VII
Following the Equator (1897)

Source: Less Than Nothing (2012), Chapter Two, The Thing Itself: Hegel, pp. 200

Religion and Science (1935), Ch. IX: Science of Ethics.
1930s
Variant: "What science cannot tell us, mankind cannot know." (Attributed to Russell in Ted Peters' Cosmos As Creation: Theology and Science in Consonance [1989], p. 14, with a note that it was "told [to] a BBC audience [earlier this century]").

Letter 130 (to the Queen of Navarre), 28 April, 1545.

As quoted in "The 90%" http://archive.indianexpress.com/news/the-90-/934145/0, The Indian Express (9 April 2012)

“We should be considerate to the living; to the dead we owe only the truth.”
On doit des égards aux vivants; on ne doit aux morts que la vérité.
Letter to M. de Grenonville (1719)
Citas

Quote from his writings Thoughts on Art, Caspar David Friedrich; as cited in Letters of the great artists – from Blake to Pollock, Richard Friedenthal, Thames and Hudson, London, 1963, p. 32
undated

Loving: Act 3, Scene 1.
Days Without End (1933)

“Shameful it is to say, yet the common herd, if only we admit the truth, value friendships by their profit.”
Turpe quidem dictu, sed, si modo vera fatemur,
vulgus amicitias utilitate probat.
II, iii, 7-8; translation by Arthur Leslie Wheeler
Epistulae ex Ponto (Letters From the Black Sea)

Plato, Republic IX: 586a-b
Plato, Republic

Warnock, Adrian, Interview with Mark Driscoll http://adrianwarnock.com/2006/04/interview-with-mark-driscoll_02.htm, Adrian's Blog, April 2, 2006.

p, 125
The Sayings of the Wise (1555)

The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.

Speech at the House of Lords in London, United Kingdom. As quoted in "The House of Lords (London)" http://www.aina.org/news/20080423181206.htm (12 March 2008), by R. Malek-Yonan, Assyrian International News Agency.

Ibn Shu’ba al-Harrani, Tuhaf al-'Uqul, p. 408.
Religious Wisdom

“The heavens and earth stay as they were; my heart
Beats as it beat: the truth remains the truth.”
Valence, in Act IV.
Colombe's Birthday (1844)

Unsourced variant: A truth that disheartens because it is true is of more value than the most stimulating of falsehoods.
Wisdom and Destiny (1898)

Principles of Mathematics (1903), Ch. I: Definition of Pure Mathematics, p. 3
1900s

Source: A General View of Positivism (1848, 1856), p. 253-254

1860s, Allow the humblest man an equal chance (1860)

RODIN, AUGUSTE. L'Art. Entretiens réunis par Paul Gsell, 1911

"The Transmission of Electric Energy Without Wires" in Electrical World and Engineer (5 March 1904)

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 349.

Hymn: The Burial of Moses http://www.bethanyipc.org.sg/poems/bulletin080113.htm

Socratic Memorabilia, J. Flaherty, trans. (Baltimore: 1967), p. 147.

First Inaugural Address (30 April 1789), published in The Writings of George Washington, edited by John C. Fitzpatrick, Vol. 30, pp. 294-5
1780s

“If one tells the truth, one is sure, sooner or later, to be found out.”
Phrases and Philosophies for the Use of the Young (1894)

2015, State of the Union Address (January 2015)

Letter to Pavel Vasilyevich Annenkov, (28 December 1846), Rue d'Orleans, 42, Faubourg Namur, Marx Engels Collected Works Vol. 38, p. 95; International Publishers (1975). First Published: in full in the French original in M.M. Stasyulevich i yego sovremenniki v ikh perepiske, Vol. III, 1912

Other

“My power is immeasurable; My truth inexplicable, unfathomable.”
Sathya Sai Baba Discourse 19-6-1974. p. 227 Sathya Sai Speaks Vol. 12.