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Thomas_Aquinas

Reason

“Reason may be employed in two ways to establish a point: first for the purpose of furnishing sufficient proof of some principle, as in natural science, where sufficient proof can be brought to show that the movement of the heavens is always of uniform velocity. Reason is employed in another way, not as furnishing a sufficient proof of a principle, but as confirming an already established principle, by showing the congruity of its results, as in astrology the theory of eccentrics and epicycles is considered as established because thereby the sensible appearances of the heavenly movements can be explained; not, however, as if this reason were sufficient, since some other theory might explain them.”
  • Source: Saint Thomas Aquinas, Summa Theologica [1266-1273], Part I, question 32, article 2 (reply to objection 2), trans. Fathers of the English Dominican Province (i.e. L. Shapeote), revised D. J. Sullivan (1952), Vol. I, 177.

Aristotle

First Principles

“For we do not think that we know a thing until we are acquainted with its primary conditions or first principles, and have carried out analysis as far as its simplest elements.”
  • Source: Aristotle (circa 350 BCE). Metaphysics. Book I. Translated into English by R. P. Hardie and R. K. Gaye.

Claude_Bernard

Hypothesis Theory Reason

“A scientific hypothesis is merely a scientific idea, preconceived or pre-visioned. A theory is merely a scientific idea controlled by experiment. Reasoning merely gives a form to our ideas, so that everything, first and last, leads back to an idea.”
  • Source: From the book "An Introduction to the Study of Experimental Medicine" written by Claude Bernard published in French in 1865 as "Introduction à l'étude de la médecine expérimentale". Translated to English by Henry Copley Greene in 1927 and republished by Henry Shuman, Inc. in 1949. Chapter I, page 26. Available online at https://archive.org/details/b21270557 retrieved 2024.

William_Ian_Beardmore_Beveridge

Role of Hypothesis

“The role of hypothesis in research can be discussed more effectively if we consider first some examples of discoveries which originated from hypotheses. One of the best illustrations of such a discovery is provided by the story of Christopher Columbus’ voyage; it has many of the features of a classic discovery in science. (a) He was obsessed with an idea—that since the world is round he could reach the Orient by sailing West, (b) the idea was by no means original, but evidently he had obtained some additional evidence from a sailor blown off his course who claimed to have reached land in the west and returned, (c) he met great difficulties in getting someone to provide the money to enable him to test his idea as well as in the actual carrying out of the experimental voyage, (d) when finally he succeeded he did not find the expected new route, but instead found a whole new world, (e) despite all evidence to the contrary he clung to the bitter end to his hypothesis and believed that he had found the route to the Orient, (f) he got little credit or reward during his lifetime and neither he nor others realized the full implications of his discovery, (g) since his time evidence has been brought forward showing that he was by no means the first European to reach America.”
  • Source: W. I. B. Beveridge in his book ‘The Art of Scientific Investigation’ published in 1950 by William Heinemann, London, page 41.

Arthur_Bloch

Murphy's Law Corollary 6

“Whenever you set out to do something, something else must be done first.”
  • Source: Attributed to Edward A Murphy, reported in the book “Murphy's Law and Other Reasons Why Things Go Wrong” written by Arthur Bloch, first edition published in 1977 by Price/Stern/Sloan, Los Angeles, California. ISBN-10: 0843104287. ISBN-13: 978-0843104288. Chapter Murphology, page 11.

Robert_N_Britcher

Limits of Testing

“The limits of software are never more obvious than in its testing. Software systems are beyond discrete and statistical analysis. A single incorrect state - out of two to the trillionth states - can down a rocket: To find such a fault in a software system would require a hundred generations of programmers - but after the first failure is found and fixed, all bets are off; they wouldn't be testing the same system anymore. We can design and build fail-safe systems, but can we know we did?”
  • Source: Britcher, Robert N. (1999). The Limits of Software: People, Projects, and Perspectives. Reading, MA: Addison Wesley. ISBN 0-201-43323-0. Page 56.

System Foresight

“No one can foresee how a system will unfold. No one gets it right the first time.”
  • Source: Britcher, Robert N. (1999). The Limits of Software: People, Projects, and Perspectives. Reading, MA: Addison Wesley. ISBN 0-201-43323-0. Page 154.

Fred_Brooks

Great Designs

“Great designs have conceptual integrity — unity, economy, clarity. They not only work, they delight, as Vitruvius first articulated.”
  • Source: Brooks Jr., F. P. (2010). The Design of Design. Upper Saddle River, NJ: Addison-Wesley. ISBN: 978-0-201-36298-5. Chapter 1, page 8.

Charles_Darwin

Primeval Tools

"When primeval man first used flint-stones for any purpose, he would have accidentally splintered them, and would then have used the sharp fragments. From this step it would be a small one to intentionally break the flints, and not a very wide step to rudely fashion them."

Edsger_Wybe_Dijkstra

Programming Styles

“There are very different programming styles. I tend to see them as Mozart versus Beethoven. When Mozart started to write, the composition was finished. He wrote the manuscript and it was 'aus einem Guss' (from one cast). In beautiful handwriting, too. Beethoven was a doubter and a struggler who started writing before he finished the composition and then glued corrections onto the page. In one place he did this nine times. When they peeled them, the last version proved identical to the first one.”
  • Source: Dijkstra (2001) Source: Denken als discipline, a program from Dutch public TV broadcaster VPRO from April 10th, 2001 about Dijkstra.

Peter_Drucker

Surviving Government

“Through systematic terror, through indoctrination, through systematic manipulation of stimulus, reward, and punishment, we can today break man and convert him into brute animal... The first step toward survival is therefore to make government legitimate again by attempting to deprive it of these powers... by international action to ban such powers.”
  • Source: Peter F. Drucker, “Landmarks of Tomorrow: A Report on the New 'Post-Modern' World”, New York: Harper & Row, 1959. p. 258.

Big University Relics

“Thirty years from now the big university campuses will be relics. Universities won't survive. It's as large a change as when we first got the printed book. Do you realize that the cost of higher education has risen as fast as the cost of health care? And for the middle-class family, college education for their children is as much of a necessity as is medical care — without it the kids have no future. Such totally uncontrollable expenditures, without any visible improvement in either the content or the quality of education, means that the system is rapidly becoming untenable. Higher education is in deep crisis.”
  • Source: Peter Drucker, “Seeing Things as They Really Are”, Forbes (March 10, 1997)

English_Proverbs

Laws of Philosophy

“The first law of philosophy: For every philosopher, there exists an equal and opposite philosopher. The second law of philosophy: They're both wrong.”
  • Source: Shared in chapter 2 of the book "The Universe - Solved!"; written by Jim Elvidge; Published in 2007 by Alternate Theories Press; ISBN 978-1-4243-3626-5.

David_Epstein

Replication Crisis

“The so-called replication crisis over the last decade has been painful for many scientists, but researchers in every discipline have been learning from it and working to improve their fields. It was, after all, scientists themselves who raised the alarm about their colleagues’ work (and in some cases their own work) in the first place. Increasingly, researchers now share or formally preregister their hypotheses at the start of a project. They can still deviate from the plan to explore unexpected findings, but the deviations are transparent. The point of restricting freedom in this way... is not to stifle inquiry but to make it more valuable.”
  • Source: David Epstein in the book “Inside the Box: How Constraints Make Us Better”. Published 2026 by Riverhead Books. Page 39. ISBN 978-0593715734 (Ebook).

Creative Constraints

“That's the thing about constraints that spur creativity: They shut down many possibilities, but stimulate more varied and novel exploration of those that remain... Given complete freedom, our very strong urge is to follow the ‘path of least resistance.’ Specifically, we do only what we have done before, or follow the first example that jumps to mind.”
  • Source: David Epstein in the book “Inside the Box: How Constraints Make Us Better”. Published 2026 by Riverhead Books. Page 58. ISBN 978-0593715734 (Ebook).

Grace_Hopper

Never Take First No

“Never, never, never take the first no. There are a certain number of people in business, industry, and government who always say no the first time you suggest something new, because they're lazy. And if they say yes, they're going to have to do something about it. But there's another group, they are even more dangerous in a way, who always say no the first time you say something new or different because they want to see if you believe in it enough to come back and ask again. So never take the first no. Always go back and ask again. As a matter of fact, I take about four no's and then I figure out how to get around the guy, but that technique comes with age. I ran into one of these guys... I noticed he always said no to things the first time. So the next time I went in to suggest something I said ‘let's pretend this is the second time I'm presenting this’. I said, ‘you always say no the first time’. And he looked at me with the funniest expression. I had him over the barrel from then on because I'd just go and say, ‘this is the fourth time I'm requesting this, let's just say yes now’. So never, never, never take the first no on a new concept. It's terribly important that we listen to our youngsters.”
  • Source: Grace Hopper in a lecture delivered 1982-08-19 at the NSA (National Security Agency). Video available at YouTube as “NSA Releases Internal 1982 Lecture by Computing Pioneer Rear Admiral Grace Hopper”, channel The Black Vault Originals, online at <https://youtu.be/_bP14OzIJWI?si=wcUTl04b4p4scY6k>, posted 2024-08, retrieved 2024-08. Quote in video at 26:28.

Kenneth_W_Kolence

Software Engineer

“There are people who call themselves software engineers, and who build software systems that other people trust their lives to that software. So a great deal of progress has really been made since 1962 (when I first began considering myself as a software engineer) and in that respect toward what may be considered as a valid engineering capability. ... Using the term [Software Engineering] ... actually did, for the first time, provide programmers with a more professional description of what they were trying to do. In my opinion, that was a very good thing.”

Alan_Perlis

First Software Engineering Conference

“This is the first conference ever held on software engineering and it behooves us to take this conference quite seriously since it will likely set the tone of future work in this field”

Computing Fun

“I think that it's extraordinarily important that we in computer science keep fun in computing. When it started out, it was an awful lot of fun. Of course, the paying customers got shafted every now and then, and after a while we began to take their complaints seriously. We began to feel as if we really were responsible for the successful, error-free perfect use of these machines. I don't think we are. I think we're responsible for stretching them, setting them off in new directions, and keeping fun in the house. I hope the field of computer science never loses its sense of fun. Above all, I hope we don't become missionaries. Don't feel as if you're Bible salesmen. The world has too many of those already. What you know about computing other people will learn. Don't feel as if the key to successful computing is only in your hands. What's in your hands, I think and hope, is intelligence: the ability to see the machine as more than when you were first led up to it, that you can make it more.”
  • Source: Quoted in The Structure and Interpretation of Computer Programs by Hal Abelson, Gerald Jay Sussman and Julie Sussman (McGraw-Hill, 2nd edition, 1996).

Bertrand_Russell

Fire Burns

“The first man who said 'fire burns' was employing scientific method, at any rate if he had allowed himself to be burnt several times. This man had already passed through the two stages of observation and generalization. He had not, however, what scientific technique demands — a careful choice of significant facts on the one hand, and, on the other hand, various means of arriving at laws otherwise than by mere generalization.”
  • Source: Bertrand Russell, (1931), In The Scientific Outlook (1931, 2009), 3.

Pure Mathematics

“Pure mathematics consists entirely of assertions to the effect that, if such and such a proposition is true of anything, then such and such another proposition is true of that thing. It is essential not to discuss whether the first proposition is really true, and not to mention what the anything is, of which it is supposed to be true. Both these points would belong to applied mathematics. We start, in pure mathematics, from certain rules of inference, by which we can infer that if one proposition is true, then so is some other proposition. These rules of inference constitute the major part of the principles of formal logic. We then take any hypothesis that seems amusing and deduce its consequences. If our hypothesis is about anything, and not about some one or more particular things, then our deductions constitute mathematics. Thus mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true. People who have been puzzled by the beginnings of mathematics will, I hope, find comfort in this definition, and will probably agree that it is accurate.”
  • Source: “Recent Work on the Principles of Mathematics”, published in 1901 within International Monthly, Vol. 4. later published as the essay “Mathematics and the Metaphysicians” within the book “Mysticism and Logic and Other Essays” by Bertrand Russell published in 1917 by George Allen & Unwin, London, England.

Anthony_Standen

First Thing About Physics

“The first thing to realize about physics ... is its extraordinary indirectness.... For physics is not about the real world, it is about “abstractions” from the real world, and this is what makes it so scientific.... Theoretical physics runs merrily along with these unreal abstractions, but its conclusions are checked, at every possible point, by experiments.”
  • Source: Anthony Standen, In Science is a Sacred Cow (1950), 60-62.

Frederick_Winslow_Taylor

Great Men Needed

“In the past the man has been first; in the future the system must be first. This in no sense, however, implies that great men are not needed. On the contrary, the first object of any good system must be that of developing first-class men; and under systematic management the best man rises to the top more certainly and more rapidly than ever before.”
  • Source: F.W. Taylor, 1911. Principles of Scientific Management. New York and London, Harper & brothers. p. 7: Introduction.

Alfred_Wegener

Continental Drift

“The first concept of continental drift first came to me as far back as 1910, when considering the map of the world, under the direct impression produced by the congruence of the coast lines on either side of the Atlantic. At first I did not pay attention to the ideas because I regarded it as improbable. In the fall of 1911, I came quite accidentally upon a synoptic report in which I learned for the first time of palaeontological evidence for a former land bridge between Brazil and Africa. As a result I undertook a cursory examination of relevant research in the fields of geology and palaeontology, and this provided immediately such weighty corroboration that a conviction of the fundamental soundness of the idea took root in my mind.”
  • Source: Alfred L. Wegener, In The Origins of Continents and Oceans (4th ed. 1929), trans. John Biram (1966), 1.

Gerald_Weinberg

Management Deskilling

“Even though the nth-level manager may have originally been a programmer, which is rare enough, he has almost certainly lost any programming ability by the time he reaches these heights. Given the rapid change of programming techniques and hardware, the higher-level manager becomes obsolete even if he retains the skills he originally had and keeps them sharply honed, for those languages and those machines are no longer in use. In a small survey of working programmers, only 15 percent of the first-line managers were thought to be as skillful as the programmers themselves, and none of the higher-level managers.”
  • Source: Chapter 6. Weinberg, G. M. (2011). The Psychology of Computer Programming (Silver anniversary edition) | 1971. Weinberg & Weinberg.