"We see that the measuring process in quantum mechanics has a "two- faced" character: it plays different parts with respect to the past and future of the electron. With respect to the past, it "verifies" the probabilities of the various possible results predicted from the state brought about by the previous measurement. With respect to the future, it brings about a new state. Thus the very nature of the process of measurement involves a far-reaching principle of irreversibility."
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Original Language: English
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Lev Landau and Evgeny Lifshitz, Quantum Mechanics: Non-relativistic theory (3rd ed., 1977)
https://en.wikiquote.org/wiki/Measurement_in_quantum_mechanics
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Measurement in quantum mechanics
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