Quotes about discretion
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"A Republic, If You Can Keep It" https://web.archive.org/web/20140327090001/http://www.thatsmags.com/shanghai/articles/12321 (2013) (original emphasis)

quoting Vogel, Steven, Life in Moving Fluids; the Physical Biology of Flow, Willard Grant Press, Boston, 1981.
Source: Permaculture: A Designers' Manual (1988), chapter 4.4

God doesn't believe in atheists (2002)
Principles of Modern Chemistry (7th ed., 2012), Ch. 4 : Introduction to Quantum Mechanics

No. 170 (28 October 1859)
The Liberator (1831 - 1866)

Sections I–II, p. 11–12
Natural Law; or The Science of Justice (1882), Chapter II. The Science of Justice (Continued)

Veblen (1917) An Inquiry Into the Nature of Peace, and the Terms of Its Perpetuation, p. 168
Source: 1970s, "Educational organizations as loosely coupled systems," 1976, p. 8
Act III, sc. iii.
The Lover's Melancholy (1628)

“Discretion is the best form of calculation.”
La discrétion est le plus habile des calculs.
La Fille aux yeux d'or http://fr.wikisource.org/wiki/La_Fille_aux_yeux_d%E2%80%99or (The Girl with the Golden Eyes) (1835), translated by Ellen Marriage, ch. III.
La Fille aux yeux d'or (1833)

Source: The Curve of the Snowflake (1956), p. 126.

Source: Elements of Refusal (1988), p. 165

Wit and humor combine in presenting serious message http://www.ourmidland.com/story_prep/article_8640fc8b-aed4-53a0-afa2-2076785c4fde.html (6 June 2011)
Matrix:Midland Festival

Purported remarks at a Bilderberg Group meeting in Baden-Baden, Germany in June 1991, as quoted in Programming, Pitfalls and Puppy-Dog Tales (1993) by Gyeorgos C. Hatonn, p. 65 and various nationalist tracts. The ultimate source for the quotation (i.e. the person who passed it on to the public) is never identified.
Disputed

Speaking out against a central bank after the Panic of 1907. From "A Central Bank as a Menace to Liberty," by George H. Earle, Jr. The Annals of the American Academy of Political and Social Science. Vol. XXXI No. 2: Lessons of the Financial Crisis, March 1908.

Saunders v. Saunders (1897), L. R. Prob. D. [1897], p. 95.
' Chapter 1. Naturalism and Impressionism
The Social History of Art, Volume IV. Naturalism, impressionism, the film age, 1999
Preface
Lacon (1820)
Source: Everyone is African: How Science Explodes the Myth of Race (2015), p. 14.

Reg. v. Labouchere (1884), 15 Cox, C. C. 425.
Source: How To Write A Sentence And How To Read One (2011), Chapter 1, Why Sentences?, p. 2
“Relativism and the Use of Language,” p. 121.
Language is Sermonic (1970)

Reflections on Various Subjects (1665–1678), V. On Conversation

Near v. Minnesota, 283 U.S. 697 (1931).
Judicial opinions

Planned Parenthood v. Casey, 505 U.S. 833 http://caselaw.lp.findlaw.com/scripts/getcase.pl?court=US&navby=case&vol=505&invol=833&friend=oyez (1992) (dissenting).
1990s

The History of Rome, Volume 2 Translated by W.P. Dickson
On Hannibal the man and soldier
The History of Rome - Volume 2
"Brotherhood by Inversion", p. 327
Leonardo's Mountain of Clams and the Diet of Worms (1998)
Methods of Mathematics Applied to Calculus, Probability, and Statistics (1985)
Context: Increasingly... the application of mathematics to the real world involves discrete mathematics... the nature of the discrete is often most clearly revealed through the continuous models of both calculus and probability. Without continuous mathematics, the study of discrete mathematics soon becomes trivial and very limited.... The two topics, discrete and continuous mathematics, are both ill served by being rigidly separated.

The Spiritual Espousals (c. 1340)
Context: You should watch the wise bee and do as it does. It dwells in unity, in the congregation of its fellows, and goes forth, not in the storm, but in calm and still weather, in the sunshine, towards all those flowers in which sweetness may be found. It does not rest on any flower, neither on any beauty nor on any sweetness; but it draws from them honey and wax, that is to say, sweetness and light-giving matter, and brings both to the unity of the hive, that therewith it may produce fruits, and be greatly profitable. Christ, the Eternal Sun, shining into the open heart, causes that heart to grow and to bloom, and it overflows with all the inward powers with joy and sweetness. So the wise man will do like the bee, and he will fly forth with attention and with reason and with discretion, towards all those gifts and towards all that sweetness which he has ever experienced, and towards all the good which God has ever done to him. And in the light of love and with inward observation, he will taste of the multitude of consolations and good things; and will not rest upon any flower of the gifts of God, but, laden with gratitude and praise, will fly back into the unity, wherein he wishes to rest and to dwell eternally with God.

No. 78
The Federalist Papers (1787–1788)
Context: There is yet a further and a weightier reason for the permanency of the Judicial offices, which is deducible from the nature of the qualifications they require. It has been frequently remarked, with great propriety, that a voluminous code of laws is one of the inconveniences necessarily connected with the advantages of a free Government. To avoid an arbitrary discretion in the Courts, it is indispensable that they should be bound down by strict rules and precedents, which serve to define and point out their duty in every particular case that comes before them; and it will readily be conceived from the variety of controversies which grow out of the folly and wickedness of mankind, that the records of those precedents must unavoidably swell to a very considerable bulk, and must demand long and laborious study to acquire a competent knowledge of them. Hence it is, that there can be but few men in the society, who will have sufficient skill in the laws to qualify them for the stations of Judges. And making the proper deductions for the ordinary depravity of human nature, the number must be still smaller of those who unite the requisite integrity with the requisite knowledge. These considerations apprize us, that the Government can have no great option between fit characters; and that a temporary duration in office, which would naturally discourage such characters from quitting a lucrative line of practice to accept a seat on the Bench, would have a tendency to throw the administration of justice into hands less able, and less well qualified, to conduct it with utility and dignity.

No. 225.
The Tatler (1711–1714)
Context: At the same time that I think discretion the most useful talent a man can be master of, I look upon cunning to be the accomplishment of little, mean, ungenerous minds. Discretion points out the noblest ends to us, and pursues the most proper and laudable methods of attaining them: cunning has only private selfish aims, and sticks at nothing which may make them succeed. Discretion has large and extended views, and, like a well-formed eye, commands a whole horizon: cunning is a kind of short-sightedness, that discovers the minutest objects which are near at hand, but is not able to discern things at a distance. Discretion the more it is discovered, gives a greater authority to the person who possesses it: cunning, when it is once detected, loses its force, and makes a man incapable of bringing about even those events which he might have done had he passed only for a plain man. Discretion is the perfection of reason, and a guide to us in all the duties of life: cunning is a kind of instinct, that only looks out after our immediate interest and welfare. Discretion is only found in men of strong sense and good understandings, cunning is often to be met with in brutes themselves, and in persons who are but the fewest removes from them.
“After hearing incessantly that the people follow him without sense or discretion, he”
The Philosophical Emperor, a Political Experiment, or, The Progress of a False Position: (1841)
Context: After hearing incessantly that the people follow him without sense or discretion, he [the political leader] is liable to fall a victim of the delusion which he has created, and to imagine that he possesses some personal attraction, by virtue of which he is followed. The delusion soon develops itself. He will diverge from the authorized track... From habit, the people will move a little in his erratic course. Their compliance augments his delusion, and he will become increasingly regardless of the popular will, and more obstinately intent on his own. He soon becomes monomaniac, and is abandoned except by a few stragglers as crazy as himself; while he interprets the abandonment into ingratitude or heterodoxy, and grows scurrilous, turbulent, and impotent.

Letter to http://rotunda.upress.virginia.edu/founders/default.xqy?keys=JSMN-print-01-14-02-0174&mode=deref w:Edmund Pendleton (21 January 1792)
1790s
Context: If Congress can do whatever in their discretion can be done by money, and will promote the general welfare, the Government is no longer a limited one possessing enumerated powers, but an indefinite one subject to particular exceptions. It is to be remarked that the phrase out of which this doctrine is elaborated, is copied from the old articles of Confederation, where it was always understood as nothing more than a general caption to the specified powers, and it is a fact that it was preferred in the new instrument for that very reason as less liable than any other to misconstruction.
The Liberals' Mistake (1987)
Context: Liberals placed an unreasonable amount of faith in large institutions: unions, foundations, big government, large corporations, and universities. These institutions are based on principles that are antithetical to democracy. They are not democratic, they are hierarchical: Someone is at the top and everybody else is at the bottom. Their policies are not made democratically, they are made at the top. These institutions are also not egalitarian. They operate by administrative discretion and authority, not the rule of law: There is no legislature, no group lawmaking body.
The individual in the large organization does not have the kind of constitutional rights that an individual in the society at large has. There are no protections of autonomy and free speech. Employees can be fired for many reasons. We need to constitutionalize large organizations to protect the people within them, to ensure that they can be politically outspoken.

No. 225.
The Tatler (1711–1714)
Context: Though a man has all other perfections, and wants discretion, he will be of no great consequence in the world; but if he has this single talent in perfection, and but a common share of others, he may do what he pleases in his station of life.

“It is a road to universals beyond discrete personal experience.”
Source: The Courage to Create (1975), Ch. 4 : Creativity and the Encounter, p. 91
Context: Symbol and myth do bring into awareness infantile, archaic dreads and similar primitive psychic content. This is their regressive aspect. But they also bring out new meaning, new forms, and disclose a reality that was literally not present before, a reality that is not merely subjective but has a second pole which is outside ourselves. This is the progressive side of symbol and myth. This aspect points ahead. It is integrative. It is a progressive revealing of structure in our relation to nature and our own existence, as the French philosopher Paul Ricoeur so well states. It is a road to universals beyond discrete personal experience.

Alan Moore on Anarchism (2009)
Context: As to how politics relate to the storytelling process, I’d say that it’s probably in the same way that politics relate to everything. I mean, as the old feminist maxim used to go, “the personal is the political.” We don’t really live in an existence where the different aspects of our society are compartmentalized in the way that they are in bookshops. In a bookshop, you’ll have a section that is about history, that is about politics, that is about the contemporary living, or the environment, or modern thinking, modern attitudes. All of these things are political. All of these things are not compartmentalized; they’re all mixed up together. And I think that inevitably there is going to be a political element in everything that we do or don’t do. In everything we believe, or do not believe.
I mean, in terms of politics I think that it’s important to remember what the word actually means. Politics sometimes sells itself as having an ethical dimension, as if there was good politics and bad politics. As far as I understand it, the word actually has the same root as the word polite. It is the art of conveying information in a politic way, in a way that will be discrete and diplomatic and will offend the least people. And basically we’re talking about spin. Rather than being purely a late 20th, early 21st century term, it’s obvious that politics have always been nothing but spin. But, that said, it is the system which is interwoven with our everyday lives, so every aspect our lives is bound to have a political element, including writing fiction.

“Discretion in speech is more than eloquence. ”
ch III: A Militia, with Navy
Political Disquisitions (1774)

As quoted in Sen. Mark Kirk withdraws support for Trump https://web.archive.org/web/20160608015204/http://chicago.suntimes.com/news/sen-mark-kirk-withdraws-support-for-trump/ by Lynn Sweet, 7 June 2016, Chicago Sun-Times.

Hjalmar Schacht, to Leon Goldensohn, March 10, 1946

Shankar Dayal Sharma, 81, Former President of India

Source: Reports of Cases Argued and Adjudged in the Supreme Court of the United States (1804) https://books.google.com/books?id=Wxm9qWvls8YC&pg=PR3