Quotes about mind
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"Stephen Hawking at 70: Exclusive interview" http://www.newscientist.com/article/mg21328460.500-stephen-hawking-at-70-exclusive-interview.html in New Scientist, (4 January 2012). In his comment that he "used to think that information was destroyed in black holes", he is referring to the black hole information paradox.

Ruminator Magazine interview with Susannah McNeely (August/September 2005).

Letter to Maurice W. Moe (16 January 1915), in Selected Letters I, 1911-1924 edited by August Derleth and Donald Wandrei, p. 10
Non-Fiction, Letters
Source: True Grit (1968), Chapter 5, pp. 82-83 : 'Mattie Ross' to 'Rooster Cogburn'

La nôtre [religion] est sans contredit la plus ridicule, la plus absurde, et la plus sanguinaire qui ait jamais infecté le monde.<p>Votre Majesté rendra un service éternel au genre humain en détruisant cette infâme superstition, je ne dis pas chez la canaille, qui n’est pas digne d’être éclairée, et à laquelle tous les jougs sont propres; je dis chez les honnêtes gens, chez les hommes qui pensent, chez ceux qui veulent penser... Je ne m’afflige de toucher à la mort que par mon profond regret de ne vous pas seconder dans cette noble entreprise, la plus belle et la plus respectable qui puisse signaler l’esprit humain.
Letters of Voltaire and Frederick the Great (New York: Brentano's, 1927), transl. Richard Aldington, letter 156 from Voltaire to Frederick II of Prussia, 5 January 1767 http://perso.orange.fr/dboudin/VOLTAIRE/45/1767/6651.html
Often misquoted as "Christianity is...", while in the context, Voltaire was referring specifically to Catholicism.
Citas

On Hinduism (2000)

Epistle to Mrs. Higgons (1690), line 79; reported in Hoyt's New Cyclopedia Of Practical Quotations (1922), "Contentment", p. 133-36.

This passage comes from a letter addressed to his wife. It was written during his imprisonment at the Bastille.
"L’Aigle, Mademoiselle…"

Remarks by President Obama and Mrs. Obama in Town Hall with Youth of Northern Ireland, Belfast Waterfront, Belfast, Northern Ireland (17 June 2013) http://www.whitehouse.gov/the-press-office/2013/06/17/remarks-president-obama-and-mrs-obama-town-hall-youth-northern-ireland
2013

Source: Fragments for an Anarchist Anthropology (2004), p. 5

"We are Power" speech (1980)

Source: The German Ideology (1845-1846), Vol. 1, Part 1.

The Problem of Peace (1954)

Talk to schoolchildren in Oyster Bay, Christmastime (1898), as quoted in The Bully Pulpit : A Teddy Roosevelt Book of Quotations (2002) by H. Paul Jeffers, p. 22
1890s

But both recognise the limitations of possibility.
Letter to Woodburn Harris (25 February-1 March 1929), in Selected Letters II, 1925-1929 edited by August Derleth and Donald Wandrei, pp. 289-290
Non-Fiction, Letters

Attributed in [ You cannot die of boredom in India http://newindianexpress.com/cities/bangalore/article537655.ece, June 07, 2012, June 23, 2012, Bond, Ruskin, Prajwala Hegde, The New Indian Express, Bangalore]

§ 1.2
Yoga Sutras of Patañjali

Letter to Frank Belknap Long (27 February 1931), in Selected Letters III, 1929-1931 edited by August Derleth and Donald Wandrei, p. 291
Non-Fiction, Letters, to Frank Belknap Long

“Your minds that once did stand erect and strong,
What madness swerves them from their wonted course?”
Quo vobis mentes, rectae quae stare solebant
Antehac, dementis sese flexere viai?
As quoted by Cicero in De Senectute, Chapter VI (Loeb translation)

"The Army of the Discontented," http://ebooks.library.cornell.edu/cgi/t/text/pageviewer-idx?c=nora;cc=nora;g=moagrp;xc=1;q1=The%20Army%20of%20the%20Discontented;rgn=full%20text;cite1=Powderly;cite1restrict=author;view=image;seq=0381;idno=nora0140-4;node=nora0140-4%3A8 North American Review, vol. 140, whole no. 341 (April 1885), p. 371.

No Second Troy http://poetry.poetryx.com/poems/1548/
The Green Helmet and Other Poems (1910)

"Uri Geller recalls his pre-spoon-bending days; Interview by Rae Lewis," The Evening Standard (London), November 2, 1998

Letter to E. Hoffmann Price (29 July 1936), published in Selected Letters Vol. V, p. 290
Non-Fiction, Letters, to E. Hoffmann Price

History of the Thirty Years War - Volume II
The Thirty Years War

"Dreams"
Everybody Else Is Doing It, So Why Can't We? (1993)
The Dietetics of the Soul; Or, True Mental Discipline (1838)

Source: 1910s, Theodore Roosevelt — An Autobiography (1913), Ch. XI : The Natural Resources of the Nation, p. 386

Statement at the beginning of the 1813 campaign, as quoted in The Mind of Napoleon (1955) by J. Christopher Herold, p. 45

On the subject of torture, in a letter to Louis Alexandre Berthier (11 November 1798), published in Correspendance Napoleon edited by Henri Plon (1861), Vol. V, No. 3605, p. 128

Listen Back To A 1990 Interview With Actor Christopher Lee http://www.npr.org/2015/06/12/413936419/listen-back-to-a-1990-interview-with-actor-christopher-lee (1990)
“If thou make any law or establish any custom for the general good, be the first to submit thyself thereto; then does a people show more regard for justice nor refuse submission when it has seen their author obedient to his own laws. The world shapes itself after its ruler's pattern, nor can edicts sway men's minds so much as their monarch's life; the unstable crowd ever changes along with the prince.”
In commune iubes si quid censesque tenendum, <br/>primus iussa subi: tunc observantior aequi <br/>fit populus nec ferre negat, cum viderit ipsum <br/>auctorem parere sibi. componitur orbis <br/>regis ad exemplum, nec sic inflectere sensus <br/>humanos edicta valent quam vita regentis.
In commune iubes si quid censesque tenendum,
primus iussa subi: tunc observantior aequi
fit populus nec ferre negat, cum viderit ipsum
auctorem parere sibi. componitur orbis
regis ad exemplum, nec sic inflectere sensus
humanos edicta valent quam vita regentis.
Panegyricus de Quarto Consulatu Honorii Augusti, lines 296-301 http://penelope.uchicago.edu/Thayer/L/Roman/Texts/Claudian/De_IV_Consulatu_Honorii*.html#296.

Nobel banquet speech http://nobelprize.org/nobel_prizes/physics/laureates/1976/ting-speech.html, December 10, 1976

Said to Enver Hoxha, on their second meeting together in March-April 1949, as quoted in Hoxha's (1986) The Artful Albanian, (Chatto & Windus, London), ISBN 0701129700
Contemporary witnesses

The Notebooks of Leonardo da Vinci (1883), XIX Philosophical Maxims. Morals. Polemics and Speculations.
Quoted from: Maharishi Mahesh Yogi - Lake Louise, Canada (1968) - MaharishiUniversity http://www.bienfaits-meditation.com/en/maharishi/videos/mechanics-of-the-technique

Press conference March 1st http://www.npr.org/blogs/thetwo-way/2013/03/01/173240651/decrying-dumb-arbitrary-cuts-obama-says-we-will-get-through-this
2013

“Shackle your mind when you bend on the cross,
When ignorance reigns life is lost.”
Township Rebellion.
Song lyrics, Rage Against the Machine (1992)

“Privacy is the right to a free mind.”
Snowden, Chomsky, and Greenwald discuss privacy https://vimeo.com/160952562, on 35:21.
2016

Other

His Nobel lecture, "How I Discovered Phase Contrast" (11December 1953) http://nobelprize.org/nobel_prizes/physics/laureates/1953/zernike-lecture.html

But since the Lecompton bill no Democrat, within my experience, has ever pretended that he could see the end. That cry has been dropped. They themselves do not pretend, now, that the agitation of this subject has come to an end yet.
1860s, Allow the humblest man an equal chance (1860)

1850s, The House Divided speech (1858)

Questions sur les miracles (1765)
Widely used paraphrase: "Those who can make you believe absurdities, can make you commit atrocities".

"This War" (1939); also in Order of the Day (1942)

The Kasîdah of Hâjî Abdû El-Yezdî (1870)

“Simple minds respond to simple answers.”
Source: Shadows Linger (1984), Chapter 33, “Juniper: The Encounter” (p. 370)

The Magi http://poetry.poetryx.com/poems/1652/
Responsibilities (1914)

Source: The Works of the Right Reverend George Horne, 1809, p. 310

Book 4, Chap. 1.
Books, Coningsby (1844)

Source: Semiology of graphics (1967/83), p. 2

L'esprit humain se plaît à ces conceptions grandioses d'êtres surnaturels. Or la mer est précisément leur meilleur véhicule, le seul milieu où ces géants près desquels les animaux terrestres, éléphants ou rhinocéros, ne sont que des nains — puissent se produire et se développer.
Part I, ch. II: Pro and Con
Twenty Thousand Leagues Under the Sea (1870)

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

Un Art de Vivre (The Art of Living) (1939), The Art of Family Life

“True enjoyment comes from activity of the mind and exercise of the body; the two are ever united.”
As quoted in A Dictionary of Thoughts : Being a Cyclopedia of Laconic Quotations from the Best Authors of the World, both Ancient and Modern (1908) edited by Tryon Edwards

2015, Town Hall meeting with Young Leaders of the Americas (April 2015)

c. 1946, p. 63-64
Attributed in posthumous publications, Albert Einstein: The Human Side (1979)

Source: Regards sur le monde actuel [Reflections on the World Today] (1931), p. 172

Interview in Viva Magazine (Dec 2009, p. 76) http://jennifer-beals.com/media/press/viva.html.