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Quotation from Relativity: The Special and General Theory by Albert Einstein
“the inertial mass of a body is not a constant but varies according to the change in the energy of the body.”
Relativity: The Special and General Theory, Part I, Section XV, trans. Robert W. Lawson
Einstein's plain-language statement of the equivalence of mass and energy.
Citation: "the inertial mass of a body is not a constant but varies according to the change in the energy of the body." — Albert Einstein, Relativity: The Special and General Theory, Part I, Section XV, trans. Robert W. Lawson. (id einstein-relativity-q4)
Portrait: Einstein 1921 by F Schmutzer - restoration, Ferdinand Schmutzer, Public domain.
