„Irrationality is the square root of all evil.“

"Irrationality is the Square Root of All Evil" (Sep, 1983) Scientific American 249 (3) article reprinted in Metamagical Themas (1985)

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Douglas R. Hofstadter Foto
Douglas R. Hofstadter1
US-amerikanischer Physiker, Informatiker und Kognitionswiss… 1945

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Robert T. Kiyosaki Foto

„The love of money is the root of all evil."

The lack of money is the root of all evil.“

—  Robert T. Kiyosaki American finance author , investor 1947

Quelle: Rich Dad, Poor Dad: What the Rich Teach Their Children About Money That the Poor and Middle Class Don't

Vladimir Nabokov Foto
George Bernard Shaw Foto
C. A. R. Hoare Foto

„Premature optimization is the root of all evil.“

—  C. A. R. Hoare British computer scientist 1934

Quote due to Donald Knuth, "Structured Programming with Goto Statements" http://pplab.snu.ac.kr/courses/adv_pl05/papers/p261-knuth.pdf, Computing Surveys 6:4 (December 1974), pp. 261–301, §1. Knuth refers to it as "Hoare's Dictum" 15 years later in "The Errors of TeX", Software—Practice & Experience 19:7 (July 1989), pp. 607–685. However, the attribution to Hoare is doubtful. http://shreevatsa.wordpress.com/2008/05/16/premature-optimization-is-the-root-of-all-evil/
Attributed

Mark Twain Foto

„The lack of money is the root of all evil.“

—  Mark Twain American author and humorist 1835 - 1910

This appears in Twain's posthumous The Refuge of the Derelicts (1905), but it had already been published by other writers.
The earliest citation found in Google Books is a 1872 article by Richard Bowker: "Our Crime Against Crimes" https://books.google.com/books?id=YZgBAAAAYAAJ&pg=PA68&dq=The+lack+of+money+is+the+root+of+all+evil&hl=en&sa=X&ved=0ahUKEwjWi5DE1crLAhUI3mMKHeSdB0YQ6AEIKzAB#v=onepage&q=%22lack%20of%20money%22&f=false, in The Herald of Health, vol. 19 no. 2, New York: Wood & Holbrook, February 1872. The saying is placed within quotation marks, perhaps indicating that it was already well-known.
A precursor is found in an article from 1859 https://books.google.com/books?id=gpdEAQAAMAAJ&pg=PA209&dq=The+lack+of+money+is+the+root+of+all+evil&hl=en&sa=X&ved=0ahUKEwjWi5DE1crLAhUI3mMKHeSdB0YQ6AEINTAD#v=onepage&q=%22lack%20of%20gold%22&f=false: It is very well to repeat, parrot-like, the old axiom that “the love of gold is the root of all evil;” but it is very certain that in truth—the lack of gold is the great incentive to crime.
Disputed

Platón Foto

„Ignorance, the root and stem of all evil.“

—  Platón Classical Greek philosopher -427 - -347 v.Chr

Attributed to Plato on quotes sites but never sourced.
Disputed

Sören Kierkegaard Foto
Ayn Rand Foto
Sören Kierkegaard Foto
George Gamow Foto

„There was a young fellow from Trinity,
Who took the square root of infinity.“

—  George Gamow Russian-American physicist and science writer 1904 - 1968

One, Two, Three... Infinity (1947)
Kontext: There was a young fellow from Trinity,
Who took the square root of infinity.
But the number of digits, Gave him the fidgets;
He dropped Math and took up Divinity.

Terry Pratchett Foto
Henry Fielding Foto

„Money is the fruit of evil as often as the root of it.“

—  Henry Fielding English novelist and dramatist 1707 - 1754

Don Quixote in England (1731), Act I, scene vi http://books.google.com/books?id=8_VbAAAAQAAJ&q=%22Money+is+the+fruit+of+evil+as+often+as+the+root+of+it%22&pg=PA13#v=onepage

Max Born Foto

„The belief that there is only one truth and that oneself is in possession of it, seems to me the deepest root of all that is evil in the world.“

—  Max Born physicist 1882 - 1970

Variants (these could be paraphrases or differing translations): The belief that there is only one truth and that oneself is in possession of it seems to me the deepest root of all evil that is in the world.
The belief that there is only one truth, and that oneself is in possession of it, is the root of all evil in the world.
Quelle: Natural Philosophy of Cause and Chance (1964), p. 230, also in My Life and Views (1968), p. 183

Samuel Butler Foto
Sören Kierkegaard Foto
Carl Sagan Foto

„In love with whole numbers, the Pythagoreans believed that all things could be derived from them. Certainly all other numbers.
So a crisis in doctrine occurred when they discovered that the square root of two was irrational.“

—  Carl Sagan American astrophysicist, cosmologist, author and science educator 1934 - 1996

37 min 45 sec
Cosmos: A Personal Voyage (1990 Update), The Backbone of Night [Episode 7]
Kontext: There can be an infinite number of polygons, but only five regular solids. Four of the solids were associated with earth, fire, air and water. The cube for example represented earth. These four elements, they thought, make up terrestrial matter. So the fifth solid they mystically associated with the Cosmos. Perhaps it was the substance of the heavens. This fifth solid was called the dodecahedron. Its faces are pentagons, twelve of them. Knowledge of the dodecahedron was considered too dangerous for the public. Ordinary people were to be kept ignorant of the dodecahedron. In love with whole numbers, the Pythagoreans believed that all things could be derived from them. Certainly all other numbers.
So a crisis in doctrine occurred when they discovered that the square root of two was irrational. That is: the square root of two could not be represented as the ratio of two whole numbers, no matter how big they were. "Irrational" originally meant only that. That you can't express a number as a ratio. But for the Pythagoreans it came to mean something else, something threatening, a hint that their world view might not make sense, the other meaning of "irrational".

Eleanor Farjeon Foto
Julius Evola Foto

„Christianity is at the root of the evil that has corrupted the West. This is the truth, and it does not admit uncertainty.“

—  Julius Evola, buch Imperialismo Pagano

Imperialismo Pagano (1928) · Excerpts http://www.juliusevola.net/excerpts/Tradition_of_the_Mysteries_against_Christianity.html

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