“To understand the phenomena of the physical world it is necessary to know the equations which the symbols obey but not the nature of that which is being symbolised.”
Science and the Unseen World (1929)
Context: If to-day you ask a physicist what he has finally made out the æther or the electron to be, the answer will not be a description in terms of billiard balls or fly-wheels or anything concrete; he will point instead to a number of symbols and a set of mathematical equations which they satisfy. What do the symbols stand for? The mysterious reply is given that physics is indifferent to that; it has no means of probing beneath the symbolism. To understand the phenomena of the physical world it is necessary to know the equations which the symbols obey but not the nature of that which is being symbolised.... this newer outlook has modified the challenge from the material to the spiritual world.<!--III, p.30
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Arthur Stanley Eddington 105
British astrophysicist 1882–1944Related quotes

Source: 20th century, Popular Scientific Lectures, (Chicago, 1910), p. 205; On aim of research.
Source: Computer Science as Empirical Inquiry: Symbols and Search (1975), p. 116. This is also called the Church–Turing thesis.

“Symbols have the unfortunate power to acquire the importance of what they symbolise.”
Source: Life, Sex, and Ideas: The Good Life Without God (2002), Chapter 4, “Symbols” (p. 19)

volume I; lecture 35, "Color Vision"; 35-1 "The human eye"; p. 35-1
The Feynman Lectures on Physics (1964)

Science and the Unseen World (1929), VII, p.73

“I was not influenced by composers as much as by natural objects and physical phenomena.”
Interview with Gunther Schuller (1965, p. 34), quoted in Sound Structure in Music (1975) bu Robert Erickson; University of California Press. .
Context: I was not influenced by composers as much as by natural objects and physical phenomena. As a child, I was tremendously impressed by the qualities and character of the granite I found in Burgundy, where I often visited my grandfather... So I was always in touch with things of stone and with this kind of pure structural architecture — without frills or unnecessary decoration. All of this became an integral part of my thinking at a very early stage.

Kosmos (1845 - 1847)
Context: The principal impulse by which I was directed was the earnest endeavor to comprehend the phenomena of physical objects in their general connection, and to represent nature as one great whole, moved and animated by internal forces. My intercourse with highly-gifted men early led me to discover that, without an earnest striving to attain to a knowledge of special branches of study, all attempts to give a grand and general view of the universe would be nothing more than a vain illusion. These special departments in the great domain of natural science are, moreover, capable of being reciprocally fructified by means of the appropriative forces by which they are endowed.