"The Dalkey archive" (1964)
Source: The Dalkey Archive
Quotes about subject
page 5
Source: How to Kill a Rock Star

Source: Postscript to the Name of the Rose
Source: Winter Garden

“A fanatic is one who can't change his mind and won't change the subject.”
Variant: A fanatic is one who can't change his mind and won't change the subject.

Letter to John Hamilton Reynolds (February 3, 1818)
Letters (1817–1820)

“I am my own muse. I am the subject I know best. The subject I want to better.”

Source: Amazing Grace: William Wilberforce and the Heroic Campaign to End Slavery

“I paint myself because I am so often alone and because I am the subject I know best.”
Quoted from: Antonio Rodríguez, "Una pintora extraordinaria," Así (17 March 1945)
1925 - 1945
Variant: I paint self-portraits because I am so often alone, because I am the person I know best.
Source: Love the One You're With

11 April 1942.
Disputed, Hitler's Table Talks (1941-1944) (published 1953)

“Other people’s tragedies should not be the subject of idle conversation.”
Source: Because of Winn-Dixie

1990s
Source: [Can Man Live Without God, 1994, 9780849939433, 12]

“Temeraire said, 'It is very nice how many books there are, indeed. And on so many subjects!”
Source: His Majesty's Dragon

Source: god is Not Great: How Religion Poisons Everything

“Everyone is ignorant, only on different subjects.”
Nationally syndicated column number 90, From Nuts To The Soup (31 August 1924); published in The New York Times http://select.nytimes.com/gst/abstract.html?res=F50A12F83D551B7A93C3AA1783D85F408285F9
Weekly columns
Variant: Everybody is ignorant, only on different subjects.

“I never had to choose my subject- my subject rather chose me.”

Source: after 1970, posthumous, Abstract Expressionism, Creators and Critics', 1990, p. 167

“Books are not made to be believed, but to be subjected to inquiry.”
William of Baskerville
Source: The Name of the Rose (1980)
Context: Books are not made to be believed, but to be subjected to inquiry. When we consider a book, we mustn't ask ourselves what it says but what it means...

“Kings will be tyrants from policy, when subjects are rebels from principle.”
Volume iii, p. 334
Source: Reflections on the Revolution in France (1790)

“When a subject becomes totally obsolete we make it a required course.”

Source: , said the shotgun to the head.
Source: Walking on Water: Reflections on Faith and Art

Civil Disobedience (1849)
Source: Civil Disobedience and Other Essays
Context: Must the citizen ever for a moment, or in the least degree, resign his conscience to the legislator? Why has every man a conscience, then? I think that we should be men first, and subjects afterward. It is not desirable to cultivate a respect for the law, so much as for the right. The only obligation which I have a right to assume is to do at any time what I think right.
Context: To speak practically and as a citizen, unlike those who call themselves no-government men, I ask for, not at once no government, but at once a better government. Let every man make known what kind of government would command his respect, and that will be one step toward obtaining it. After all, the practical reason why, when the power is once in the hands of the people, a majority are permitted, and for a long period continue, to rule, is not because they are most likely to be in the right, nor because this seems fairest to the minority, but because they are physically the strongest. But a government in which the majority rule in all cases cannot be based on justice, even as far as men understand it. Can there not be a government in which majorities do not virtually decide right and wrong, but conscience? — in which majorities decide only those questions to which the rule of expediency is applicable? Must the citizen ever for a moment, or in the least degree, resign his conscience to the legislator? Why has every man a conscience, then? I think that we should be men first, and subjects afterward. It is not desirable to cultivate a respect for the law, so much as for the right. The only obligation which I have a right to assume is to do at any time what I think right. It is truly enough said that a corporation has no conscience; but a corporation of conscientious men is a corporation with a conscience. Law never made men a whit more just; and, by means of their respect for it, even the well-disposed are daily made the agents of injustice.

“Nothing is so loved by tyrants as obedient subjects.”

“Some subjects are so serious that one can only joke about them.”
Sometimes attributed to Heisenberg, this was actually a statement made by Niels Bohr, as quoted in The Genius of Science: A Portrait Gallery (2000) by Abraham Pais, p. 24
Some things are so serious that one can only joke about them.
Variant without any citation as to author in Denial is not a river in Egypt (1998) by Sandi Bachom, p. 85
Misattributed
“I will take a serious approach to a subject usually treated lightly, which is a nerdy thing to do.”
Source: American Nerd: The Story of My People

“Civilization exists by geological consent, subject to change without notice.”
"What is Civilization?" Ladies' Home Journal, LXIII (January, 1946).

“No one writes anything worth writing, unless he writes entirely for the sake of his subject.”
Source: The Art of Literature

“After all, everyone's favorite subject is themselves.”
Source: The Game: Penetrating the Secret Society of Pickup Artists
Source: The Slumber of Christianity: Awakening a Passion for Heaven on Earth
Source: I'd Tell You I Love You, But Then I'd Have to Kill You

Source: The Fabric of the Cosmos: Space, Time, and the Texture of Reality

“It is a narrow mind which cannot look at a subject from various points of view.”
Source: Middlemarch

“I did best when I had least truth for my subjects.”
Source: The Complete Poetry and Selected Prose

April 18, 1775, p. 258
Life of Samuel Johnson (1791), Vol II

1880s, 1880, Letter to Theo (Cuesmes, July 1880)
Source: The Letters of Vincent van Gogh
Context: So please don't think that I am renouncing anything, I am reasonably faithful in my unfaithfulness and though I have changed, I am the same, and what preys on my mind is simply this one question: what am I good for, could I not be of service or use in some way, how can I become more knowledgeable and study some subject or other in depth? That is what keeps preying on my mind, you see, and then one feels imprisoned by poverty, barred from taking part in this or that project and all sorts of necessities are out of one's reach. As a result one cannot rid oneself of melancholy, one feels emptiness where there might have been friendship and sublime and genuine affection, and one feels dreadful disappointment gnawing at one's spiritual energy, fate seems to stand in the way of affection or one feels a wave of disgust welling up inside. And then one says “How long, my God!”
Source: Perfect Timing

Such vulgarity is healthy and safe.
Herzog on Herzog (2002)

Source: The Lords and the New Creatures: Poems (1969), The Lords: Notes on Vision

Source: The Scarlet Letter (1850), Chapter XXIV: Conclusion
Context: It is a curious subject of observation and inquiry, whether hatred and love be not the same thing at bottom. Each, in its utmost development, supposes a high degree of intimacy and heart-knowledge; each renders one individual dependent for the food of his affections and spiritual life upon another; each leaves the passionate lover, or the no less passionate hater, forlorn and desolate by the withdrawal of his object.

“Love, our subject:
we've trained it like ivy to our walls.”

Source: Quoted in Herbert Howarth, Notes on Some Figures behind T. S. Eliot (Boston: Houghton Mifflin, 1964), p. 89

Ein Fachmann ist ein Mann, der einige der gröbsten Fehler kennt, die man in dem betreffenden Fach machen kann, und der sie deshalb zu vermeiden versteht.
Der Teil und das Ganze. Gespräche im Umkreis der Atomphysik (1969); also in "Kein Chaos, aus dem nicht wieder Ordnung würde", Die Zeit No. 34 (22 August 1969); as translated in Physics and Beyond : Encounters and Conversation (1971)