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The electron is a theory we use; it is so useful in understanding the way nature works that we can almost call it real.
--
Part 2: the Princeton Years

 

Richard Feynman

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The idea of a God we infer from our experimental dependence on something superior to ourselves in wisdom, power and goodness, which we call God; our senses discover to us the works of God which we call nature, and which is a manifest demonstration of his invisible essence. Thus it is from the works of nature that we deduce the knowledge of a God, and not because we have, or can have any immediate knowledge of, or revelation from him.

 

Ethan Allen

 

In the interior of the atom, Bohr had tried the plan of retaining the particle-electron and modifying the classical mechanics. Heisenberg took the opposite course, his procedure amounting in effect to retaining the classical mechanics, at least in form, and modifying the electron. Actually, the electron dropped out all together, because it exists only as a matter of inference and not of direct observation. For the same reason, the new theory contains no mention of atoms, nuclei, protons, or of electricity in any shape or form. The existences of all these are matters of inference, and Heisenberg's purely mathematical theory could no more make contact with them than with the efficiency of a turbine or with the price of wheat.

 

James Jeans

 

It would, however, be wrong to think of an electron as a bullet-like structure with tentacles sticking out from its surface. We can calculate the mass of the bullet, and also the mass of the tentacles. The two masses are found to be identical, each agreeing with the known mass of the electron. Thus we cannot take the electron to be bullet plus tentacles... The two pictures do not depict two different parts of the electron, but two different aspects of the electron. They are not additive but alternative; as one comes into play, the other must disappear.

 

James Jeans

 

When we speak of the aim and Art observable in Shakespeare's works, we must not forget that Art belongs to Nature; that it is, so to speak, self-viewing, self-imitating, self-fashioning Nature. The Art of a well-developed genius is far different from the Artfulness of the Understanding, of the merely reasoning mind. Shakspeare was no calculator, no learned thinker; he was a mighty, many-gifted soul, whose feelings and works, like products of Nature, bear the stamp of the same spirit; and in which the last and deepest of observers will still find new harmonies with the infinite structure of the Universe; concurrences with later ideas, affinities with the higher powers and senses of man. They are emblematic, have many meanings, are simple and inexhaustible, like products of Nature; and nothing more unsuitable could be said of them than that they are works of Art, in that narrow mechanical acceptation of the word.

 

William Shakespeare

 

When we speak of the aim and Art observable in Shakespeare's works, we must not forget that Art belongs to Nature; that it is, so to speak, self-viewing, self-imitating, self-fashioning Nature. The Art of a well-developed genius is far different from the Artfulness of the Understanding, of the merely reasoning mind. Shakspeare was no calculator, no learned thinker; he was a mighty, many-gifted soul, whose feelings and works, like products of Nature, bear the stamp of the same spirit; and in which the last and deepest of observers will still find new harmonies with the infinite structure of the Universe; concurrences with later ideas, affinities with the higher powers and senses of man. They are emblematic, have many meanings, are simple and inexhaustible, like products of Nature; and nothing more unsuitable could be said of them than that they are works of Art, in that narrow mechanical acceptation of the word.

 

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