Quotes about differential
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Source: New results in linear filtering and prediction theory (1961), p. 95 Article summary; cited in: " Rudolf E. Kálmán http://www-history.mcs.st-andrews.ac.uk/Biographies/Kalman.html", MacTutor History of Mathematics archive, 2010

Speech to the Trades Union Congress at Bridlington (7 September 1949), quoted 'Chronology, 18 August 1949 - 7 September 1949', Chronology of International Events and Documents, Vol. 5, No. 17 (18 August-7 September 1949), p. 583
1940s
Source: Mathematical Thought from Ancient to Modern Times (1972), p. 442.
Max Velmans (2009) Understanding Consciousness, Edition 2. Routledge/Psychology Press, p. 298

Source: https://theosophy.world/sites/default/files/ebooks/Annie%20Besant-In-The-Outer-Court.pdf In the Outer Court, 1895, p. 57

Darwin's Dangerous Disciple: An Interview by Frank Miele (1995)

“I feel that in order to truly be an actor, you have to differentiate yourself and your roles.”
Interview by Michael J. Lee, Executive Editor for Radio Free Entertainment May 24, 2005 http://www.radiofree.com/profiles/michelle_trachtenberg/interview01.shtml

Roy A. Childs, Jr., The Epistemological Basis of Anarchism: An Open Letter to Objectivists and Libertarians,” Part I, (1969); : Republished in: Roy A. Childs, Jr. Anarchism & Justice, Libertarianism.org Press, 2012.

Ann Druyan interviewed by the Committee for Skeptical Inquiry. — "Ann Druyan Talks About Science, Religion, Wonder, Awe … and Carl Sagan" http://www.csicop.org/si/show/ann_druyan_talks_about_science_religion/. Skeptical Inquirer 27 (6). November–December 2003.

Source: Words of a Sage : Selected thoughts of African Spir (1937), p. 42.

Van Gogh, the Man Suicided by Society (1947)

Journals VA 14
1840s, The Journals of Søren Kierkegaard, 1840s

Constance Reid Hilbert (Springer-Verlag, 1996) [ISBN 0-387-94674-8] p. 182. Also quoted in Max Jammer, The Conceptual Development of Quantum Mechanics (McGraw-Hill, 1966) pp. 207-208. Jammer cites the original reference: Edward U. Condon 60 Years of Quantum Physics, Physics Today 15 37-49 (1962)

Speaking to the House of Assembly on January 28, 1981, as cited by Andrew Donaldson, Sunday Times, 5 November 2006

December, 1918
India's Rebirth
Source: General System Theory (1968), 3. Some System Concepts in Elementary Mathematical Consideration, p. 69

Source: "Cosmic Connections" by Lawrence Krauss, 2011 http://www.youtube.com/watch?v=FjAqcV_w3mc (23:22-23:35)
Source: "Related diversification, core competences and corporate performance", 1994, p. 164
Introduction to Chivalry (1921) by James Branch Cabell, later published in Prometheans : Ancient and Modern (1933), p. 279
Context: It is true, of course, that like the fruit of the tree of life, Mr. Cabell's artistic progeny sprang from a first conceptual germ — "In the beginning was the Word." That animating idea is the assumption that if life may be said to have an aim it must be an aim to terminate in success and splendor. It postulates the high, fine importance of excess, the choice or discovery of an overwhelming impulse in life and a conscientious dedication to its fullest realization. It is the quality and intensity of the dream only which raises men above the biological norm; and it is fidelity to the dream which differentiates the exceptional figure, the man of heroic stature, from the muddling, aimless mediocrities about him. What the dream is, matters not at all — it may be a dream of sainthood, kingship, love, art, asceticism or sensual pleasure — so long as it is fully expressed with all the resources of self. It is this sort of completion which Mr. Cabell has elected to depict in all his work: the complete sensualist in Demetrios, the complete phrase-maker in Felix Kennaston, the complete poet in Marlowe, the complete lover in Perion. In each he has shown that this complete self-expression is achieved at the expense of all other possible selves, and that herein lies the tragedy of the ideal. Perfection is a costly flower and is cultured only by an uncompromising, strict husbandry.
Source: Mathematical Thought from Ancient to Modern Times (1972), p. 346
Context: Fermat applied his method of tangents to many difficult problems. The method has the form of the now-standard method of differential calculus, though it begs entirely the difficult theory of limits.

The Tragic Sense of Life (1913), I : The Man of Flesh and Bone
Context: Man is said to be a reasoning animal. I do not know why he has not been defined as an affective or feeling animal. Perhaps that which differentiates him from other animals is feeling rather than reason. More often I have seen a cat reason than laugh or weep. Perhaps it weeps or laughs inwardly — but then perhaps, also inwardly, the crab resolves equations of the second degree.

Founding Address (1876)
Context: The freedom of thought is a sacred right of every individual man, and diversity will continue to increase with the progress, refinement, and differentiation of the human intellect. But if difference be inevitable, nay, welcome in thought, there is a sphere in which unanimity and fellowship are above all things needful. Believe or disbelieve as ye list — we shall at all times respect every honest conviction. But be one with us where there is nothing to divide — in action. Diversity in the creed, unanimity in the deed! This is that practical religion from which none dissents. This is that platform broad enough and solid enough to receive the worshipper and the "infidel." This is that common ground where we may all grasp hands as brothers, united in mankind's common cause.

Mathematical Methods in Science (1977)
Context: Even if without the Scott's proverbial thrift, the difficulty of solving differential equations is an incentive to using them parsimoniously. Happily here is a commodity of which a little may be made to go a long way.... the equation of small oscillations of a pendulum also holds for other vibrational phenomena. In investigating swinging pendulums we were, albeit unwittingly, also investigating vibrating tuning forks.<!--p.224

Your Thought and Mine
Context: Your thought sees power in armies, cannons, battleships, submarines, aeroplanes, and poison gas. But mine asserts that power lies in reason, resolution, and truth. No matter how long the tyrant endures, he will be the loser at the end. Your thought differentiates between pragmatist and idealist, between the part and the whole, between the mystic and materialist. Mine realizes that life is one and its weights, measures and tables do not coincide with your weights, measures and tables. He whom you suppose an idealist may be a practical man.

Source: The Book on the Taboo Against Knowing Who You Are (1966), p. 60

Source: The Nature of the Physical World (1928), Ch. 13 : Reality

Antonio Labriola, Socialism and Philosophy (1897) [original in Italian]
G - L

Above two quotes by Charu Gupta a critique writing in her Essay “Portrayal of Women In Premchand’s stories: A critique”

The portion of the Integral Calculus, which properly belongs to any given portion of the Differential Calculus increases its power a hundred-fold...
The Differential and Integral Calculus (1836)

1900s, God Does Not Exist (1904)

Source: Discipleship (1937), Discipleship and the Cross, p. 86

Part 1 “Four Classical Arguments”, Chapter 2 “The Argument from Design (and Some Creationist Calculations)” (p. 19)
Irreligion: A Mathematician Explains Why the Arguments for God Just Don’t Add Up (2008)

As quoted in "Parasite Star Park So-dam on Life Since the Oscars and New Korean Drama Record of Youth" in Time Magazine (16 September 2020) https://time.com/5889002/park-sodam-parasite-record-of-youth-interview/

“A baby is lots more fun than differential equations.”
Source: Podkayne of Mars (1963), Chapter 10 (p. 127)

“It is not enthusiasm, but dogma, that differentiates a Christian from a pagan society.”
Source: The Idea of a Christian Society (1939), Ch. IV, p. 59