Electric and magnetic forces. ...

Electric and magnetic forces. May they live for ever, and never be forgot, if only to remind us that the science of electromagnetics, in spite of the abstract nature of its theory, involving quantities whose nature is entirely unknown at the present, is really and truly founded on the observations of real Newtonian forces, electric and magnetic respectively.
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 Oliver Heaviside

Quotes from the same author

The best result of mathematics is to be able to do without it.
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 Oliver Heaviside
...there is no absolute scale of size in nature, and the small may be as important, or more so than the great.
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 Oliver Heaviside
However absurd it may seem, I do in all seriousness hereby declare that I am animated mainly by philanthropic motives. I desire to do good to my fellow creatures, even to the Cui bonos.
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 Oliver Heaviside
Mathematics is an experimental science, and definitions do not come first, but later on.
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 Oliver Heaviside
Theory is the essence of facts. Without theory scientific knowledge would be only worthy of the madhouse.
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 Oliver Heaviside