“To say that prediction is the purpose of a scientific theory is to confuse means with ends. It is like saying that the purpose of a spaceship is to burn fuel. … Passing experimental tests is only one of many things a theory has to do to achieve the real purpose of science, which is to explain the world.”

— David Deutsch , book The Fabric of Reality

Source: The Fabric of Reality (1997), Ch. 1

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British physicist 1953

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“To say that prediction is the purpose of a scientific theory is to confuse means with ends. It is like saying that the purpose of a spaceship is to burn fuel.”

David Deutsch book The Fabric of Reality

Source: The Fabric of Reality (1997), Ch. 1
Context: To say that prediction is the purpose of a scientific theory is to confuse means with ends. It is like saying that the purpose of a spaceship is to burn fuel. … Passing experimental tests is only one of many things a theory has to do to achieve the real purpose of science, which is to explain the world.

“No one has yet discovered any warlike purpose to be served by the theory of numbers or relativity, and it seems unlikely that anyone will do so for many years.”

G. H. Hardy book A Mathematician's Apology

A Mathematician's Apology (1941)

“How we come to have the world-views we do is an interesting question. No doubt reason plays a part, but human needs for meaning and purpose are usually more important. At times personal taste may be what decides the issue. There is nothing to say that, when all the work of reason is done, only one view of the world will remain. There may be many that fit everything that can be known. In that case you might as well choose the view of the world you find most interesting or beautiful. Adopting a world-view is more like selecting a painting to furnish a room than testing a scientific theory. The test is how it fits with your life.”

John Gray (1948) British philosopher

Freedom for Über-Marionettes: What Science Won't Tell You (p. 150)
The Soul of the Marionette: A Short Enquiry into Human Freedom (2015)

“A logical theory may be tested by its capacity for dealing with puzzles, and it is a wholesome plan, in thinking about logic, to stock the mind with as many puzzles as possible, since these serve much the same purpose as is served by experiments in physical science.”

Bertrand Russell (1872–1970) logician, one of the first analytic philosophers and political activist

"On Denoting", Mind, Vol. 14, No. 56 (October 1905), pp. 479–493; as reprinted in Logic and Knowledge: Essays, 1901–1950, (1956)
1900s

“My purpose is to explain, not the meaning of words, but the nature of things.”
Meum institutum non est verborum significationem sed rerum naturam explicare

Baruch Spinoza book Ethics

Ethics (1677)

“Men follow their sentiments and their self-interest, but it pleases them to imagine that they follow reason. And so they look for, and always find, some theory which, a posteriori, makes their actions appear to be logical. If that theory could be demolished scientifically, the only result would be that another theory would be substituted for the first one, and for the same purpose.”

Vilfredo Pareto book Manual of Political Economy

page 95.
Manual of Political Economy

“The Steady State theory was what Karl Popper would call a good scientific theory: it made definite predictions, which could be tested by observation, and possibly falsified. Unfortunately for the theory, they were falsified.”

Stephen Hawking (1942–2018) British theoretical physicist, cosmologist, and author

The Beginning of Time (1996)

“One truth we have been able to count on concerning scientific persuit over the centuries has been that only testable theories survive the intense scrutiny of experimental science.”

John Moffat book Reinventing Gravity

Source: Reinventing Gravity (2008), Chapter 8, Strings And Quantum Gravity, p. 136

“A theory is only as good as its assumptions. If the premises are false, the theory has no real scientific value. The only scientific criterion for judging the validity of a scientific theory is a confrontation with the data of experience.”

Maurice Allais (1911–2010) French economist; 1988 winner of the Nobel Memorial Prize in Economics

L'anisotropie de l'espace. La nécessaire révision de certains postulats des théories contemporaines. Les données de l'expérience (1997), p. 591

“Awareness is the power that is concealed within the present moment. … The ultimate purpose of human existence, which is to say, your purpose, is to bring that power into this world.”

Eckhart Tolle (1948) German writer

Source: A New Earth: Awakening to Your Life's Purpose

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